Abstract

Have any attempts been made to define food? Out of the three essentials in life, a meal is the complex chemical our bodies depend on for sustenance. Food is the third most vital component of life that sustains us, behind air and water. Food is obviously important and necessary. Our bodies need nutrients and energy to grow, be active and healthy, move, play, work, think, and learn. Healthy eating gives us these things. (Shriram, 22) [1]. Because each food or liquid has a certain nutrition, such as carbs, protein, vitamins, minerals, lipids, etc., which are crucial for our physical and mental development, foods are closely tied to our body, mental health, and social health.There is a strong bond between food and culture that is both practical and emotional. The food that was available to them served as the foundation for many aspects of different cultures. Making and consuming cuisine from one’s home country helps keep people who leave their cultural contexts linked. They also spread it throughout, and it fits nicely with the surrounding culture. [1,2 (Shriram, R. (22, 04 10). ACME COLLINS…) (Soken-Huberty, 21)]. The idea of a brain gut microbiome axis, which mediates bidirectional communication between the gut, its microbiome, and the neurological system, has been established, mostly based on findings from preclinical investigations. A variety of brain-gut illnesses may be influenced by changes in these interactions, according to the limited human data available.We all know that food has an impact on your physical health, but even the act of preparing it has significance. According to studies, confidence, focus, and happiness can all be boosted by cooking and baking. The justification is that cooking is a creative activity, and like other creative activities, it helps people feel happier and less stressed. It’s crucial to research how it contributes to or treats mental disease.The main inquiry of this study, which is supported by pertinent evidence, is how certain everyday, widely consumed foods, such as coffee, tea, nuts, vegetables, or various dietary patterns, such as intermittent fasting or probiotic plant-based diets, affect a person’s overall lifestyle and how they may affect conditions like schizophrenia, which are not yet clearly linked, are unknown.[3,4, (Quddusi, 2018…. (Osadchiy, 2019)]

Keywords : microbiology, diagnosis, microbiome, genetics

Introduction

Have you ever wondered whether food could be more than just a fundamental necessity for survival? Everyone is aware of the influence food has on a person’s life, for example, how eating a low-carb diet makes one thinner, how eating a lot of protein makes one muscular, or how vitamin consumption affects how well one’s skin and hair appear. All of these physical effects, or to put it another way, discernible changes, are today’s concerns of every person when it comes to food. Some modifications, nevertheless, are not readily apparent. It’s always simpler to connect food with physical wellbeing, not giving a second consideration to how food can affect mental wellbeing, which is another factor in an individual’s general wellbeing.

Mental health

Interestingly, one of the most common things to do when one is unhappy is to eat sweets or chocolates. A popular adage is “Stressed is backwards transcribed as desserts,” but one shouldn’t stop there. One could also consider why and what motivates people to seek for something sweet when they experience stressful or depressing emotions.

Bidirectional communication of brain and gut, The complex bidirectional relationship between the gut and the brain involves systems like the endocrine, immune, autonomic, and enteric neurological systems. Additionally, there is increasing evidence that the microbiome and the chemicals made by the microbiota play a part in regulating these connections; however, the mechanisms underlying these effects are still being worked out. The interactions between the microbiota and gut peptides are anticipated to have a significant impact on the modulation of gut-brain signaling.[5Carabotti, M. S. (2015). Carabotti, M…]

Have any attempts been made to define food? Out of the three essentials in life, a meal is the complex chemical our bodies depend on for sustenance. Food is the third most vital component of life that sustains us, behind air and water. Food is obviously important and necessary. Our bodies need nutrients and energy to grow, be active and healthy, move, play, work, think, and learn. Healthy eating gives us these things. (Shriram, 22) [1]. Because each food or liquid has a certain nutrition, such as carbs, protein, vitamins, minerals, lipids, etc., which are crucial for our physical and mental development, foods are closely tied to our body, mental health, and social health.There is a strong bond between food and culture that is both practical and emotional. The food that was available to them served as the foundation for many aspects of different cultures. Making and consuming cuisine from one’s home country helps keep people who leave their cultural contexts linked. They also spread it throughout, and it fits nicely with the surrounding culture. [1,2 (Shriram, R. (22, 04 10). ACME COLLINS…) (Soken-Huberty, 21)]. The idea of a brain gut microbiome axis, which mediates bidirectional communication between the gut, its microbiome, and the neurological system, has been established, mostly based on findings from preclinical investigations. A variety of brain-gut illnesses may be influenced by changes in these interactions, according to the limited human data available.We all know that food has an impact on your physical health, but even the act of preparing it has significance. According to studies, confidence, focus, and happiness can all be boosted by cooking and baking. The justification is that cooking is a creative activity, and like other creative activities, it helps people feel happier and less stressed. It’s crucial to research how it contributes to or treats mental disease.The main inquiry of this study, which is supported by pertinent evidence, is how certain everyday, widely consumed foods, such as coffee, tea, nuts, vegetables, or various dietary patterns, such as intermittent fasting or probiotic plant-based diets, affect a person’s overall lifestyle and how they may affect conditions like schizophrenia, which are not yet clearly linked, are unknown.[3,4, (Quddusi, 2018…. (Osadchiy, 2019)]

Part of the brain-gut mechanism involves the complexity of the gastrointestinal (GI) tract. The GI tract contains specialized enteroendocrine cells (EECs) that release more than 20 signaling chemicals that can communicate with the brain and carry out critical metabolic and endocrine functions [6 (J., Gastrointestinal hormones and the dialogue between gut and brain., 2014) ]. It is now clear that EECs, which make up less than 1% of the total population of gut epithelium cells, are regulated by the gut microbiota [7,8,9 (J., Enteroendocrine cell signalling via the vagus nerve., 2013) (Cani, (2013)) (Cohen, 2017)Cohen, L. J.-F. (2017). Commensal…], which as a whole describes the population of non-human bacterial organisms. The diversity and make-up of enteric bacteria directly affects the release of gut peptides like glucagon-like peptide-1 (GLP-1), peptide YY (PYY), cholecystokinin (CCK), corticotropin-releasing factor (CRF), oxytocin, and ghrelin [6,10,11,12 (J., Gastrointestinal hormones and the dialogue between gut and brain., 2014)J., D. G. (2014). Gastrointestinal hormones and the…, (Latorre, 2016) (Psichas, (2015).) (Gribble, 2016]. To understand the mechanism of gut peptides through the brain- gut axis refer (figure 1) .We still don’t fully understand the mechanisms underlying interactions between the EEC and the microbiota.

Note. There are numerous mechanisms through which the gut microbiota may signal the brain to control physiological processes. These include the release of gut peptides by enteroendocrine cells (EECs) where they activate cognate receptors of the immune system and on vagus terminals in the gut. Gut peptides such as neuropeptide Y (NPY) can also be released by cytokines under immune stimulation. There have been numerous reports of alterations in the gut microbiota in neuropsychiatric conditions, where gut peptides may play a key signaling role. Only a few examples of gut–brain pathway and gut peptides are represented in this figure.

CCK = cholecystokinin; GLP-1 = glucagon-like peptide; CRF = corticotropin-releasing factor; PYY = peptide YY; GABA = γ-aminobutyric acid; SCFA = short-chain fatty acid. [5 (Carabotti, 2015)]

See Table 1 for a summary of many compounds produced by bacteria that have been found to have an effect on the brain.(Table 1).

In addition to the signaling molecules mentioned above, the gut and the brain are continually communicating with one another. Such communication may have an impact on an individual’s perception of visceral events including nausea, satiety, and pain, and it may be crucial in mediating physiological effects ranging from GI function to the brain and behavior. In addition to the information traveling to the brain, there are brain-based signals that travel in the other direction. For example, GI secretions and motility are impacted by stressful circumstances. The therapeutic relevance of such bidirectional communication and alterations in the gut flora are currently the subject of investigations. GI tract sensory information that is transformed into neural, hormonal, and immunological signals may be the beginning of the bidirectional gut-brain link [13 (Bellono, (2017))]. These signals can carry information to the brain singly or in combination (CNS). The current study touches on the immunological and neurological pathways as necessary.

The gut-brain axis (GBA), which links the brain’s emotional and cognitive centers to the intestine’s peripheral functions, serves as a conduit for communication between the central (brain and spinal cord) and enteric (gut) neural systems. Recent advances in science have emphasized the importance of the gut microflora in influencing these interactions. This interaction between microbiota and GBA appears to be bidirectional, with signals traveling both ways from the gut microbiota to the brain and from the brain to the gut microbiota via neurological, endocrine, immunological, and humoral links. [4 (Osadchiy, 2019)]

Understanding the crosstalk between the gut and the brain has revealed a complicated communication system that ensures the proper maintenance of gastrointestinal homeostasis. Additionally, several effects on mood, motivation, and higher cognitive abilities are anticipated from this system. [14 (Rhee SH, 2009;)]. In addition to connecting the brain’s affective and cognitive centers to peripheral intestinal activities, its duty is to monitor and integrate gut events. Mechanisms involved in this process include immune activation, intestinal permeability, the enteric reflex, and entero-endocrine signaling. The mechanisms underlying GBA communications involve neuro-immuno-endocrine mediators. Figure 2 represents a summary of this relationship, and Figure 3 .[4 (Osadchiy, 2019)]

Eating patterns

Our eating patterns can also impact this relationship.[18 (Simeonova D, 2018)] For example. stress can cause a “leaky gut” [17,19 (Jiang H, 2015) (Bonaz BL, 2013)]by increasing the permeability of the intestinal barrier. The mucosal membrane may become permeable to bacteria and their byproducts as a result of this loss of integrity.[19,20 (Bonaz BL, 2013) (Friebe A, 2011)] In many mental health diseases, including Alzheimer’s and schizophrenia[20,21 (Friebe A, 2011) (Köhler CA, 2016;)], this bacterial translocation can result in autointoxication, which fuels the chronic inflammatory state.[15, 16 (Alagiakrishnan, (2020) ) (Souza DG, 2004;)]

In actuality, how we relate to food is a significant factor. A recent line of research has focused on encouraging conscious food selection, increasing awareness of the distinctions between physical and psychological hunger, observing the symptoms of satiety, and eating healthfully in response to all of these cues. In this current body of literature, the “mindful eating” (ME) movement places an emphasis on being mindful of the present moment while eating, observing the impact of food on the senses, and accounting for one’s bodily and emotional reactions to the eating experience.The imbalance of the structure and operation of the gut intestinal microbiota is known as microbial dysbiosis. It is a widespread issue in the modern period and is brought on by bacterial infections, dietary changes, and antibiotics. Recent studies have shown that intestinal illnesses like [Irritable bowel disorder.] IBD, irritable bowel syndrome (IBS), and celiac disease are related to dysbiosis of the gut microbiota. Through competition for nutrients and space, beneficial bacteria in the digestive tract prevent harmful bacteria from infiltrating and growing. Intriguingly, probiotics are one of the most important treatments for reestablishing the gut’s microbial balance and preventing infections in patients after antibiotic therapy, which results in dysbiosis of the gut microbiota.[23, 24, (Morillo Sarto, 2019) (Gerald J Holtmann, 2016)]

Link to cognitive disorders

With the development of genomic technologies, schizophrenia (SZ) may now be studied in its potential relationship to gut microbiome, which can yield a wealth of information for the potential diagnosis and prognosis of SZ. Diverse microbial taxa drove community splitting in each of the previous research of the gut microbiome in SZ patients, which confirmed that the species structure inside the stomach of SZ patients differs from that of normal control subjects (NCs), and a number of these research findings also concentrated on the association between various gut microbiota and clinical characteristics [26,27,28, (Nguyen T. T., 2019) (Schwarz E, 2018;),, (Li S. Z., 2020)] Other neuropsychiatric illnesses, in addition to SZ, like depression[29], bipolar disorder [30 (Hu, 2019)], autism[31 (Tomova, 2015)], Alzheimer’s disease [32 (Cattaneo, 2017)], and Parkinson’s disease[33 (Caputi, 2018)], have been linked to a dysregulated MGB axis.[25, 34, 35 (Li S. S., 2021) (Desbonnet, 2014) (Sampson, 2016) ] (organize the citations)

One potential source for this relationship is Brain-derived neurotrophic factor (BDNF) and glial cell line-derived neurotrophic factor (GDNF), which can both influence neural development and brain plasticity[36 (Sudo, 2004)], and are just two examples of the neurotrophic factors whose expression the gut microbiota can regulate. Recently, new information on the MGB axis in SZ patients has been published. According to Nguyen et al.[37 (Nguyen T. T., 2018)], SZ may be linked to gastrointestinal inflammation. Additionally, SZ patients frequently have gastrointestinal and digestive disorders[38 (Saha, 2007)]. The connection between the gut microbiome and brain shape and function, however, has received little research attention.

Impact of specific food items

Finally, there is broad agreement that plant-based eating regimens like the Mediterranean, DASH(Dietary Approaches to Stop Hypertension), and MIND diets (Mediterranean-DASH Intervention for Neurodegenerative Delay) enhance general cognitive function and prevent age related cognitive decline (ARCD). Numerous plant foods, including berries high in polyphenols, fruit juices, coffee, tea, cocoa, and nuts, have a positive effect on cognitive health. When it comes to frontal executive functions like attention, processing speed, and memory encoding, consolidation, and retrieval, polyphenols appear to have the strongest protective effects. Possible processes underpinning the neurocognitive advantages include better neurogenesis, decreased oxidative stress and neuroinflammation, increased cerebral blood flow, and neuroplasticity [40,41,42 (Joris PJ, 2018) (Lamport DJ, 2015;) (Flanagan E, 2018;.)]. In addition to polyphenols, n-3 PUFAs and other antioxidant micronutrients may collaborate to improve cognitive wellbeing.[39, (Sujatha Rajaram, Issue Supplement_4, November 2019)]

In this review, we will concentrate on dietary compounds that directly interact with gut microorganisms and travel through the gut-brain axis to the brain, and we’ll talk about how that affects host physiology, gut microbial ecology, and health. Even thousands of years later, Hippocrates’ dictum that “Let food be thy medicine and medicine be thy food” is still very much applicable and requires thought about how diet might be utilized to influence brain ecology to improve health.

Methods

For this review, a literature research was carried out using primarily the following databases: NCBI, PubMed, ScienceDirect , Google Scholar search engine to collect all of the literature cited. In our search, the parameters included studies published in the last 10 years, and available in English. Keywords used to search included: types of food, cognitive disorders , gut microbiota , brain-gut axis ,impact of food on mental illness, dietary patterns ,cultural differences . The studies gathered in our review included only patients with AD , dementia, SZ and some common gut-brain illnesses . The patients were in the age bracket of above 60 years of age and even childrens .

We relied on the above-mentioned search engines for assistance and data. We wanted to include review papers , meta – analysis with experimental evidence of the impact of food on the cognitive abilities of normal persons’ brains. In the end we included a total of roughly 50 articles.

The purpose of this narrative review is to investigate the effectiveness of diet in contribution and improvement of various cognitive disorders , so many articles contained these interventions for our data collection. A literature research was carried out using the following databases: NCBI, PubMed, ScienceDirect, Google Scholar

All clinical trials were used to create a more comprehensive review. These included interventional trials randomized controlled trials, observational trials, case-control studies, systematic reviews etc. Furthermore, this study focused majorly on the types of food and neurochem they contains as well the gut microbiome : thus, the type used in the intervention comparative studies for different geographical regions and ages to study the impact of different food and their different outcomes over a person’s cognitive health was another important factor when choosing articles.

Results

In order to form a link between the foods we eat and their possible link to brain health via the gut axis, we first examined how different food items compared to levels of fuel, d-glutamate,In addition to having a significant impact on cognition, behavior, and psychiatry, molecular chirality has been shown to influence protein folding, neuronal proliferation, and brain functional laterality [44 (Dyakin, Justin Lucas Dyakina-Fagnano, Posner, & Vadasz, 2017, )]. Enantiomers may differ significantly from one another due to differing pharmacologic and pharmacokinetic features, according to previous research [45 (Baker, Prior, & Coutts, 2002,)]. The notion that d-type amino acids are new neurotransmitters is supported by a recent research discovery [46Mothet, J., & Snyder, S. (2012,…]. Experiments on d-glutamate are scarce, and it is unclear how they affect neurocognitive function. A pilot human investigation revealed that d-glutamate levels are related to cognitive skills in SZ or AD patients [49 (Lin, Yang, & Lane, 2019, ) ], while animal studies have found greater d-glutamate levels in particular brain regions [47,48 (Mangas, et al., 2007, ) (Kawase, et al., 2017, )] This can also be seen in Table 2.

The brain-gut-microbiota axis may significantly contribute to neurodegeneration,Clinical appearance of neurodegenerative disorders is determined by the increasing malfunctioning of particular populations of neurons. The characteristic of many neurodegenerative proteinopathies, extracellular and intracellular accumulation of misfolded proteins, is linked to neuronal death.[43 (Chang, (2020)) (Dyakin, Justin Lucas Dyakina-Fagnano, Posner, & Vadasz, 2017, )]

Furthermore, glutamate signaling disruption, the brain’s main excitatory neurotransmitter, has a role in poor learning and memory. In individuals with neuropsychiatric diseases, changes in the gut microbiota and metabolite composition, particularly glutamate, have been observed. Two-keto-glutaramic acid, a glutamate metabolite, is lowered by gut microbiota Bacteroides vulgatus and Campylobacter jejuni. Additionally, the gut bacteria Corynebacterium glutamicum, Brevibacterium lactofermentum, and Brevibacterium avium can convert l-glutamate to d-glutamate using glutamate racemase.

Additionally, benzoate, a DAAO (d-amino acid oxidases) inhibitor, can raise d-serine levels, which in turn promotes NMDAR activation. Previous pilot studies have discovered that benzoate may help schizophrenia patients’ cognition. The movement of glutamate is controlled by the blood-brain barrier (BBB), which is the endothelial lining of the brain capillaries. Brain-to-blood glutamate efflux can be mediated by brain capillary endothelial cells [51,50 (Helms, Nielsen, Waagepetersen, & Brodin, 2017, ) (Hawkins & Vina, 2016, )]. The blood contains glutamate concentrations that are 5 to 50 times lower than those in the brain, preventing glutamate from entering the brain [52 (Bai & Zhou, 2017, )]. The two membranes that make up the BBB are luminal (blood facing) and abluminal (brain facing), and they complement one another in their functions. Only the luminal membranes have facilitative glutamate transport, whereas the abluminal membrane has a glutamate transport mechanism that is Na+-dependent. Transmembrane proteins known as glutamate transporters are produced by the translation of members of the solute carrier (SLC) gene families SCL 1, SLC 7, SLC 17, and SLC 25 [53 (Fotiadis, Kanai, & Palacin, 2013, )].

Human glutamate metabolism has been extensively studied in earlier studies. Selective transporters, such as excitatory amino acid carrier C1 (EAAC1) on the apical membrane of enterocytes, are able to absorb the most amino acids in the gastrointestinal tract after ingesting foods containing glutamate [54 (Burrin & Stoll, 2009, )]. Approximately 75%-96% of enteral glutamate is transported to the splanchnic arteries during the first-pass effect. Additionally, >80% of this glutamate is transformed into energy to sustain intestinal function [56,55 (Janeczko, Stoll, Chang, Guan, & Burrin, 2007, ) (Hays, Ordonez, Burrin, & Sunehag, 2007, )]. The synthesis of gut proteins may potentially be influenced by glutamate. They participate in a number of metabolic pathways, including the creation of important amino acids like arginine and proline, citrulline, and the antioxidant glutathione [57Reeds, P., Burrin, D., Stoll, B.,…]. They are also transformed into carbon and nitrogen donors. Additionally, along with l-form amino acids, d-form amino acids have recently been discovered to exist in a variety of foods and beverages, including milk, cheese, fish, vegetables, fruits, alcoholic beverages, vinegar, ham/meat, coffee, and milk powder [58Marcone, G., Rosini, E., Crespi, E.,…]. The reported proportion of d-glutamate in relation to the total amounts of amino acids is summarized in [Table 2]. Fermented foods contain significant amounts of d-glutamate. 27.4% of instant coffee [59,60 (Palla, Marchelli, Dossena, & Casnati, 1989, ) (Brückner & Hausch, Detectio0n of free D-amino acids in food by chiral phase capillary gas chromatography. , 1989, )] and 32%-41% of roasted coffee, respectively, contain d-glutamate. Yogurt has 12.4% d-glutamate, Yakult has 24.2%, Parmigiano Reggiano has 15%, and so on [62,63,61 (Jin, Miyahara, Oe, & Toyo’oka, 1999, ) (Marchelli, et al., 2007; ) (Brückner & Hausch, D-amino acids in dairy products: Detection, origin and nutritional aspects. I. Milk, fermented milk, fresh cheese and acid curd cheese. , 1990, )]. Varied fermentation techniques could result in different amounts of d-amino acids being produced. Different types of D-amino acids are produced by lactic fermentation using lactic acid bacteria [64 (Kobayashi, 2019, )For instance, the glutamate racemase in Lactobacillus plantarum changes l-glutamate into d-glutamate.[65 (Bohmer, Dautel, Eisele, & Fischer, 2013, )]

In order to understand whether there is a relationship between cognition based on eating specific food types, we describe several types of food below. This can also be seen in Table 2

Phenol-rich berries and fruit juices

Polyphenols, such as found in grape, citrus fruits – oranges , promgerant , cherries, cocoa etc, have been shown to have positive impacts on brain health in studies [66 (Gildawie KR, 2018;)], and there is growing evidence linking polyphenol consumption to slowed cognitive aging in older adults [67 (Valls-Pedret C, 2012)]. Review of studies on fruit juices high in polyphenols can be found in Table [3]. Despite the limited amount of research, fruit drinks, such as orange, grape, and pomegranate juice, seem to have a good impact on cognition. In healthy older people, consumption of high-flavanone orange juice (OJ) increased global cognition as measured by the mean z-score of numerous measures of executive function and episodic memory when compared to a low-flavanone control (500 mL/d for 8 wk) [68 (Kean RJ, 2015;1)]. Notably, effects were primarily seen in immediate recall on tests of episodic memory, which frequently reflects frontal executive components of attention and memory encoding.

Among beverages high in antioxidants, pomegranate juice has the highest content of phenolics and the most antioxidant activity, followed by red wine, Concord grape juice, and blueberry juice [69 (Harnly JM, 2006;)]. Pomegranate juice contains a large amount of anthocyanins and hydrolysable tannins, such as glycosides of ellagic acid. In comparison to the placebo group, older persons who took pomegranate juice for four weeks showed enhanced encoding and retrieval on a test of verbal memory [70 (Bookheimer SY, 2013;)]. These improvements were also accompanied by increases in brain activity that were specific to the verbal and visual tasks. Pomegranate polyphenols also showed to improve memory function by boosting cerebral blood flow during certain tasks.

In four small RCTs(Randomized Controlled Trials), older persons who regularly consumed grapes (100 percent Concord grape juice or an active grape formulation made from freeze-dried grape powder from California grapes) were compared to those who consumed a placebo. In older persons with early memory deterioration but without dementia, daily ingestion of Concord grape juice (6.3–7.8 mL/kg body weight for 16 weeks) improved Verbal Learning Test results as compared to placebo [71 (Krikorian R N. T.-H., 2010;)] scores.What’s interesting about this is that there was no measurable difference after 16 weeks of daily Concord grape juice consumption suggesting There was no difference in learning and retention scores, but therapy resulted in less semantic interference on memory tasks (P = 0.004) and more right hemisphere activity on fMRI.[40 (Joris PJ, 2018)]

Overall, citrus fruit juices, pomegranate juice, grape juice, and cherry juice, all with large amounts of polyphenols of different subtypes, appear to exert brain-protective effects and improve global or domain-specific cognitive function in as little as 4 weeks of consumption. Based on the above studies, acute benefits after a single dose are unlikely and longer-term daily consumption could be necessary to achieve observable effects on cognition. Further, benefits might be less relevant for younger adults and more pronounced in older adults at risk for either age-related or pathological cognitive decline. Specifically, there appears to be most benefit in frontal-executive functions including attention and memory encoding and retrieval.

Additionally, flavonoids like catechin and epicatechin, kaempferol and myricetin, as well as the anthocyanins delphinidin and petunidin, are all abundant in berries. Through a number of hypothesized mechanisms, including the suppression of microglia-mediated inflammation and the reduction of vascular risk through a decrease in blood pressure and oxidative stress, which is aided in part by neuronal and inducible nitric oxide production, these flavonoids are thought to be neuroprotective and slow brain aging [66,73, 72 (Gildawie KR, 2018;) (Potì, (2019)) (Spagnuolo C, 2018)].

Human research has backed the use of berries to enhance cognitive well-being, following data from animal studies confirming the importance of berry-rich diets in motor performance, working memory, and enhanced neurogenesis [76,75 (Galli RL, 2016) (Shukkit-Hale B, 2015;)]. [74,77-79 (Nones, 2011)) (Devore EE, 2012) (Travica N, 2019, ) (Kent K, 2017;) ]. Strawberries and blueberries dramatically slowed the deterioration of elderly women’s language comprehension and global cognition, [69 (Kean RJ, 2015;1)]. The impacts of reinforcing with various blueberry formulations on cognition were examined in three RCTs, and a mixed-berry beverage containing blueberries, blackcurrants, elderberries, lingonberries, strawberries, and tomatoes was used in a fourth [80-84 (Whyte AR, . 2018;.) (Miller MG, 2018;) (Bowtell JL, 2017;) (Nilsson A, 2017;) (Krikorian R S. M.-T.-H., . 2010)]. (Table 3). In healthy senior people, reductions in shifting inaccuracies on a task-switching test and repetition errors on a verbal learning test were seen after consuming a freeze-dried blueberry supplement (equal to about 150 g fresh blueberries) for 90 days[81 (Miller MG, 2018;)]. Similarly, robust seniors’ efficiency in visual recall and episodic recognition memory was improved after consuming blueberry concentrate for three months [82 (Bowtell JL, 2017;)]. After just 5 weeks, blueberries improved working memory in healthy older subjects when combined with other fruits and berries, but no changes were seen in the areas of selective attention or psychomotor reaction time [84 (Krikorian R S. M.-T.-H., . 2010) ]. Elderly subjects with early cognitive impairment or more severe cognitive complaints showed improved verbal memory function with blueberry supplementation [80,84-86 (Whyte AR, . 2018;.)(Krikorian R S. M.-T.-H., . 2010) (McNamara RK, 2018;) (Bensalem J, 2019;)]. According to brain imaging studies, increased brain perfusion and activation of brain regions relevant to cognitive function appear to go hand in hand with the beneficial effects of blueberry supplementation on cognition domains [82 (Miller MG, 2018;)].

Both tea and coffee, which are well-known sources of caffeine, are also great sources of polyphenols. Coffee includes significant levels of phenolic acids, including some catechols and the hydroxycinnamic acids 4- and 5-caffeoylquinic acids (19 and 43 mg/mL, respectively). Catechins, epicatechins, and procyanidins are the main flavonoids found in green tea, while hydroxybenzoic and hydroxycinnamic acids and 5-caffeoylquinic acid are found in smaller concentrations. Green tea and coffee are frequently the most significant sources of polyphenols in diets [88,87 (Zamora-Ros R, 2016;) (Burkholder-Cooley N, 2016;)]. For example, in a prospective cohort study of seniors with cognitive stability (aged 69 to 86 years), participants who consumed coffee had a lower risk of showing decline on two cognitive tests over the course of three years[89 (Haller S, 2018;)]. Additionally, white matter preservation was better in cognitively stable participants who consumed coffee in the second and third tertiles. Green tea catechols, particularly epigallocatechin gallate, but also epigallocatechin, epicatechin, rutin, and L-theanine, may play a role in mitochondrial dysfunction and the prevention of amyloid formation [90 (Polito CA, 2018;)]. Together, regular consumption of tea and coffee may reduce the likelihood of developing cognitive problems, however the relationship is J-shaped for coffee and linear for green tea.

Last but not least, tree nuts and legumes are likewise abundant in polyphenols, albeit there haven’t been many studies on their effects on human cognition [Table 4 ]. This evaluation does not include research that examines the relationship between nut consumption and cognition in younger individuals or studies that take into account postprandial effects. All nuts, but walnuts stand out for their nutrient-rich matrix of polyunsaturated fats, including both linoleic and -linolenic acid and antioxidant polyphenols that may influence neuronal function and advance brain health through synergistic effects. Whole walnut extract guarded primary neuronal cells in vitro from oxidative and inflammatory stress caused by calcium dysregulation, which suppressed microglial activation [91 (Thangthaeng N, 2018)]. By raising the expression of neurotropic proteins like BDNF, which promote neuronal development and survival, n-3 PUFAs may also have neuroprotective benefits [92 (Hadjighassem M, 2015)]. Additional bioactive components in walnuts, including arginine, tocopherols, folate, melatonin, and polyphenols, promote cognitive health by modifying a number of cardiovascular risk factors [93 (E., 2015;)]. Almonds, Brazil nuts, and walnuts are the nuts with the highest concentration of free and total polyphenols[69 (Harnly JM, 2006;)].Pro-anthocyanidins, a kind of flavan-3-ol flavonoid, make up the majority of the polyphenols. Walnuts are a major source of ellagic acid, a phenolic antioxidant also present in pomegranates, strawberries, and almonds. There is an urgent need for more research on other nuts and cognition in both cognitively healthy and cognitively impaired people. Future research should also take into account pairing nutrients that have been shown to have significant impacts on cognition, such as blueberries and walnuts [74,94 (Nones, 2011)) (Poulose SM, ;2014)]. Although significant protection from ARCD (age related cognitive decline ) was not observed, older [96,95 (O’Brien J, 2014) (Koyama AK, 2015;) ] and middle-aged [97 (Nooyens AC, 2011;) ] persons who consumed nuts at least five times per week had higher global cognition and verbal memory composite scores than less frequent users. Younger and older persons who regularly ate walnuts had superior recall test scores, quicker reaction times, and higher single-digit learning scores than non-consumers in a cross-sectional study [98 (Arab L, 2015;)]. Similarly, consumption of legumes, nuts, and seeds was linked to better cognition in older adults from Greece, with regular users being less likely to receive subpar MMSE (Mini Mental State Examination) results [99 (Katsiardanis K, 2013;)]. Only two RCTs on nuts and cognition in the elderly, using either Brazil nuts or walnuts, have been conducted until present. Participants with MCI who ate one Brazil nut per day for six months performed better on tests of verbal fluency and constructional praxis but did not vary from controls in terms of global cognition [100 (Cardoso BR, 2016;) ]. Selenium, an antioxidant mineral used in seleno proteins crucial for brain function, is present in Brazil nuts [101 (Steinbrenner H, . 2013;)].

Cocoa

Flavonoids are abundant in cocoa, which is made from the dried, fermented seeds of the Theobroma cacao plant. The flavan-3-ol epicatechin, as well as catechin and other oligomeric procyanidins, are particularly abundant in cocoa. Epicatechins appear to pass the blood-brain barrier in animals and may act directly on the brain. Through improved neurogenesis, particularly the survival and proliferation of new hippocampal neurons, and an increase in synaptic development by BDNF stimulation, flavonoids from cocoa have been linked to improving neuroplasticity [66 ,73,72 (Gildawie KR, 2018;) (Krikorian R N. T.-H., 2010;)(Spagnuolo C, 2018)].

Moringa oleifera Lam.

The cruciferous plant Moringa oleifera Lam. (M. oleifera) is a member of the Moringaceae family. Locals refer to M. oleifera as the drumstick tree or the horseradish tree, and it is a widespread food worldwide. M. oleifera is used for both its nutritional and therapeutic qualities [102 (Mahmood, Mugal, & Haq, 2010, )]. Beta-carotene, vitamin C, vitamin E, and polyphenols are abundant in M. oleifera leaves, which are also a strong source of natural antioxidants [103 (Anwar, Latif, Ashraf, & Gilani, 2007,)]. A wide range of biological processes, including anti-inflammatory, anti-cancer, hepatoprotective, and neuroprotective properties, are now claimed to be improved by M. oleifera [102,105,104 (Mahmood, Mugal, & Haq, 2010, ) (Abdull, Ibrahim, & Kntayya, 2014, ) (Posmontier, 2011, )]. Numerous studies have also demonstrated its therapeutic benefits, including those for the treatment of diabetes, rheumatoid arthritis, atherosclerosis, infertility, pain alleviation, anti-depression, and thyroid and diuretic management [106, 107 (Banji, Banji, & Kavitha, 2012, ) (Chumark, et al., 2008, )]

Under challenging treatment circumstances, M. oleifera has been found to promote neuronal expansion and survival [109,108 (Hannan, et al., 2014, ) (Sutalangka, Wattanathorn, Muchimapura, & Thukham-mee, 2013,) ]. A 30 g/mL ethanol extract from M. oleifera leaves, for instance, has been shown to stimulate neurite outgrowth and neuronal differentiation from primary embryonic neurons in a concentration-dependent manner [108 (Hannan, et al., 2014, )]. The length of axons, the number and length of dendrites and axonal branching, and eventually the facilitation of synaptogenesis have all been seen to increase in response to M. oleifera leaf extract [108 (Hannan, et al., 2014, )]. Additionally, earlier research has shown that M. oleifera leaf extract effectively reduces neurodegeneration in hippocampal regions, and dentate gyrus leading to enhanced spatial memory [109 (Sutalangka, Wattanathorn, Muchimapura, & Thukham-mee, 2013,) ]. Mechanically, it can also lower levels of malondialdehyde (MDA) and acetylcholinesterase (AChE), while also boosting SOD and catalase (CAT) activity.

Piper

However, secondary metabolites from piper species have also demonstrated biological effects on human health. Piper species are aromatic plants used as culinary spices. The fruits, seeds, leaves, branches, roots, and stems of these plants contain a wealth of essential oils. Others, like Piper nigrum, Piper betle, and Piper auritum, include quite complex suites of secondary metabolites, whereas certain Piper species have straightforward chemical profiles. Globally, Piper species have been used in traditional medicine to treat a variety of illnesses, including urological issues, skin, liver, and stomach problems, wound healing, and as antipyretic and anti-inflammatory drugs. Additionally, Piper species may be employed in food preservation as natural antioxidants and antimicrobials.Compared to synthetic antioxidants, the phytochemicals and essential oils of Piper species have proven considerable antioxidant activity. They also showed antibacterial and antifungal properties against human infections. In addition, there are various chronic illnesses that Piper species can treat or prevent. Based on preclinical in vitro and in vivo studies, as well as clinical studies, it is believed that among the functional properties of Piper plants, extracts, and active components, the antiproliferative, anti-inflammatory, and neuropharmacological activities of the extracts and extract-derived bioactive constituents are key effects for the protection against chronic conditions.

The leading causes of disability and death worldwide are chronic diseases such type II diabetes, cardiovascular diseases, cancer, and neurological disorders. However, lifestyle adjustments, especially dietary changes, can prevent or at least delay the onset of the majority of these disorders[110 (Sharifi-Rad, et al., 2018, )]. It has been proven that Piper species have the ability to treat and prevent a number of chronic diseases. The neuropharmacological activities of the extracts and the bioactive elements produced from the extracts are regarded to be important impacts for the protection against chronic diseases, among the functional qualities of Piper plants.

Piperine has been shown to have significant effects on Central nervous system degenerative diseases including AD and PD. However, a number of pharmacological issues, including limited water solubility, significant first-pass metabolism, and low absolute oral bioavailability, make it difficult to transport piperine to the brain orally [111 (Elnaggar, Etman, Abdelmonsif, & Abdallah, Novel piperine-loaded Tween-integrated monoolein cubosomes as brain-targeted oral nanomedicine in Alzheimer’s disease: Pharmaceutical, biological, and toxicological studies. , 2015, )]. Recently, there has been a lot of research into the use of brain-targeted nanosystems to enhance the transport properties of difficult lipophilic active substances. Different solid lipid nanoparticles have been used in studies to demonstrate piperine encapsulation, and the results suggest that piperine-loaded nanoparticles significantly lessen the severity of neurodegenerative illnesses modeled in experimental animals [111,112 (Elnaggar, Etman, Abdelmonsif, & Abdallah, Novel piperine-loaded Tween-integrated monoolein cubosomes as brain-targeted oral nanomedicine in Alzheimer’s disease: Pharmaceutical, biological, and toxicological studies. , 2015, ) (Elnaggar, Etman, Abdelmonsif, & Abdallah, Intranasal piperine-loaded chitosan nanoparticles as brain-targeted therapy in Alzheimer’s disease: Optimization, biological efficacy, and potential toxicity. , 2015, )].In a recent study by Etman et al. [113 (Etman, Elnaggar, Abdelmonsif, & Abdallah, 2018, 19, )], piperine-loaded oral microemulsion as a nanosystem improved piperine efficacy and enhanced its delivery to the brain, leading to a better therapeutic outcome compared to the free drug in Alzheimer’s model male Wistar rats. Piperine-loaded chitosan-sodium tripolyphosphate nanoparticles improve neuroprotection and reduce astrocyte activation in a chemical kindling model of epilepsy, according to a recent study by Anissian et al. [114 (Anissian, et al., 2018,) ].

Cultural differences

There is growing evidence that adopting a plant-based diet can reduce your risk of developing dementia and ARCD. The plant foods and nutrients prioritized in the Mediterranean, DASH, and MIND dietary patterns may be significant in preventing cognitive impairment, according to recent assessments of epidemiological data and intervention trials [116,117, 118,115, 119–124 (Abbatecola AM, 2018;) (Masana MF, 2017;) (Yannakoulia M, 2015) (Petersson SD, 2016;) (Chen X, 2019;) (Loughrey DG, 2017;) (Berendsen AM, 2018) (Berendsen AAM, 2017;) (Aridi YS, 2017;) (Morris MC, 2015;) ]. Despite the fact that these three dietary patterns include a diversity of plant foods, the dietary patterns of geographically distinct cohorts also show similarities in the prominence of particular plant foods and their overall positive effect on cognition [125–133 (Chan R, 2014;) (Qin B, 2015;) (Kim J, 2015;) (HJ., 2015) (Chen YC, 2017) (Okubo H, 2017) (Nurke E, 2010;) ]. These findings essentially agree with studies looking at the DII(Dietary Inflammatory Index) in connection to cognitive function [141, 134–137 (Frith E, 2018) (Shin D, 2018) (Hayden KM, 2017;) (Kesse-Guyot E, 2017;) (Assman KE, 2018.)].

Table 5 summarizes the relationship between dietary habits that emphasize plants and cognition in a number of Asian cohorts. Green leaves and other vegetables, soy, whole grains, green tea, mushrooms, and seaweed are plant foods that Asians frequently eat [125–130 (Chan R, 2014;) (Qin B, 2015;) (Kim J, 2015;) (HJ., 2015) (Chen YC, 2017) (Okubo H, 2017) ]. Many of these plant-based diets are linked to lower rates of cognitive impairment [125, 126 (Chan R, 2014;) (Qin B, 2015;)], slower rates of cognitive decline [127,128 (Kim J, 2015;) (HJ., 2015)], better logical memory test results [129 (Chen YC, 2017)], and higher global cognitive assessment scores [130 (Okubo H, 2017)]. The cognitive outcomes of older persons from other nations (Norway, Australia, Italy) who consume a diet rich in fruits, vegetables, and legumes are likewise better [131–133 (Nurke E, 2010;) (Ashby-Mitchell K, 2015;) (Mazza E, 2017) ]. It’s interesting to note that Asian diets place less emphasis on the vibrant fruits, vegetables, nuts, non-soy legumes, and olive oil found in the Mediterranean diet and other dietary patterns. Techniques used in food preparation and processing are also crucial factors. The diets associated with better cognitive outcomes in various Asian cohorts [126, 129 (Qin B, 2015;) (Chen YC, 2017)] include stir-fried (in oil) and fermented vegetables (pickled cabbage), which may increase the bioavailability of phytochemicals [139,138 (Wickzkowski W, 2016;) (Bohn T, 2015) ]. Similar to this, it has been demonstrated that eating “multigrain rice” (brown rice, millets, black rice, and barley) rather than “white rice and noodles” reduces the risk of cognitive impairment in older Asians [126 (Qin B, 2015;) ], which is linked to the higher total polyphenol content in whole grains [140 (Goufo P, 2017;)]. Therefore, rather than relying on a single diet, the presence of a range of plant foods rich in accessible bioactive chemicals may be crucial for preventing ARCD [115–124 (Abbatecola AM, 2018;) (Masana MF, 2017;) (Yannakoulia M, 2015) (Petersson SD, 2016;) (Chen X, 2019;) (Loughrey DG, 2017;) (Berendsen AAM, 2017;) (Berendsen AM, 2018) (Aridi YS, 2017;) (Morris MC, 2015;) (Chan R, 2014;) ].

Both European Americans and African Americans have serum levels of 25(OH)D (25-hydroxyvitamin D) that are significantly linked with bone mineral density [142 (Bischoff-Ferrari, Dietrich, Orav, & Dawson-Hughes, 2004, )], but it has long been known that Africans and African Americans have higher bone mineral density (BMD) [143 ( Bell, 1997, )] and a lower risk of fragility fractures than Europeans [144 (Aloia, 2008, )]. Possible explanations include the fact that compared to European Americans, African Americans have higher calcium retention, poorer calcium outflow, and higher bone parathyroid hormone resistance [143,146,145 (Bell, 1997, ) (Aloia, 2008, ) (Gutierrez, Farwell, Kermah, & Taylor, 2011, )]. Although the cause of populations moving from Africa to higher latitudes evolving thinner bones is unknown, a trade-off for a decrease in pelvic deformity and labor obstruction has been proposed [147 (Vieth, 2020, )]. Whatever the causes, it appears that many people do not consider the low blood levels of 25(OH)D in African Americans to be a problem because of their stronger bones and the perception that the only effect of low 25(OH)D levels is poor bone health. Notably, the 2011 IOM review of vitamin D neglected to highlight how common vitamin D deficiency is among African Americans, even by their strictest definition of less than 12 ng/mL, and came to the conclusion that “requirements are being met by most, if not all, persons in both countries [US and Canada]”.

Food Preparation

Intermittent fasting and probiotic supplements both have positive effects on health on their own, but combining the two may increase these advantages. The PRObiotics and Intermittent FASTing to Improve Prediabetes (PROFAST) experiment sought to determine whether daily probiotic supplements and intermittent fasting can lower HbA1c in people with prediabetes. The findings of this study will add to the expanding body of research on the benefits of probiotic supplementation and intermittent fasting for the prevention of various diseases. As with other programmes, success depends on how closely participants follow dietary recommendations. Between their pre-intervention diet and their post-intervention diet, participants reported a moderate change in their diet. Additionally, participants noted that they were generally more conscious of their eating habits. Participants reported fewer episodes of overeating during the intervention, despite the fact that pretreatment binge eating disorder was not examined. This suggests that implementing an intermittent fasting regimen may affect eating behavior more favorably than unfavorably. Inconsistent correlations were discovered between the initiation of binge eating in people without previous binge eating and extreme dietary energy restriction (i.e., low or very low energy diets) in a systematic study that was published in 2015 [148 (Da Luz, et al., 2015, ) ]. As a result, it is confirmed that calorie restriction may not always result in unfavorable eating habits in those who do not have binge eating disorder, while preoperative screening is still advisable.[149 (Tay, (2020).)]

Data presented as mean ± standard deviation. Abbreviations: IF, intermittent fasting; g/d, grams per day; % TE, percentage of total energy. 1 Repeated measures analysis of variance. All nutrient measures include fasting days unless otherwise specified.

Conclusion

Evidence overwhelmingly points to plant-based dietary patterns that are rich in fruits, vegetables, nuts, seeds, legumes, and whole grains while placing less of an emphasis on processed foods and animal products as a desirable and effective strategy for preventing chronic diseases [150–152 (Carlos S, 2018;) (Medina-Remon A, 2018;) (Dinu M, 2017;)]. Such dietary patterns, from plant-exclusive diets to plant-centered diets, are linked to better long-term health outcomes and a lower risk of all-cause mortality [154, 153 (Kim H, 2018;) (Papandreou C, 2018;) ]. It is rational to assume that plant-based diets can reduce cognitive decline given that neurodegenerative illnesses and cardiovascular disorders share many pathophysiological pathways, such as oxidative stress, inflammation, and vascular damage.

Furthermore, Piper species have demonstrated their biological effects in numerous in vitro, in vivo, and clinical studies, in addition to the previously known usage in traditional medicine. Globally, the leading causes of disability and death are chronic illnesses and neurodegenerative diseases. Due to its antiproliferative, anti-inflammatory, and neuropharmacological properties, piper species have shown to have the ability to treat and prevent a number of chronic diseases. According to all of the research done on Piper species, these plants have potential as a cure for disorders that are inflammatory in nature. Due to the extensive use of standardized Piper plants, additional efforts should be made to research them using well-designed studies. The creation of functional meals based on Piper species also has a wide variety of potential applications.[155 (Salehi, (2019).)]

Additionally, Through the execution of its powerful anti-inflammatory action, inhibition of the activation of the NF-B and PI3K/Akt pathways, alleviating oxidative stress by scavenging free radicals, and improving neuroprotective roles, M. oleifera possesses a wide variety of medicinal and therapeutic qualities. M. oleifera can also control blood sugar levels and lower the chance of developing cancer, while the underlying mechanisms need more research. As a result, M. oleifera offers the possibility of preventing or treating a number of chronic disorders.

We should recognise that in addition to diet, lifestyle factors like getting enough sleep, relax, and exercise also affect the risk for cognitive impairment. The most efficient way to lower the population’s risk for age-related chronic decline ARCD may be a holistic strategy that addresses both dietary and lifestyle factors proven to enhance cognition. In conclusion, plant-centered eating habits that emphasize foods high in polyphenols, d-glutamate , herbs and nuts , fruits which can benefit the cognitive health of the aged population.[156 (Kou, (2018).)] Schizophrenia is a mental illness in which sufferers have psychotic symptoms such as delusions, hallucinations, and frequently disorganized speech. Additionally, patients may exhibit decreased emotional expressiveness, avolition, and impairment in social and vocational performance. Numerous investigations with people with schizophrenia revealed changes in the gut microbiota compared to healthy controls . Germ-free mice who received a faecal transplant from a person with schizophrenia had behaviors associated with schizophrenia [158,157 (Zheng P, 2019;) (Zhang X, 2020)]. In a human investigation, a decline in the number of Faecalibacterium can cause an increase in gut TH17 cells in schizophrenia patients [159 (Zhang X, 2020)]. These cells may pass the blood-brain barrier and stimulate the microglia in the hippocampus, resulting in aberrant behavior [159 (Zhang X, 2020)].

[Table 10]In addition to discovering that specific bacterial phyla like Veillonellaceae and Lachnospiraceae were connected to illness severity, Zheng et alstudy .’s on schizophrenia discovered that both untreated and treated individuals had changed gut microbiota [157 (Zheng P, 2019;)]. When compared to healthy controls, patients who had their first episode of psychosis had a change in their Lactobacillaceae [27Schwarz E, M. J. (2018;). Analysis of… ]. Additionally, this study discovered that during a one-year follow-up, people with the most changed microbiome populations had the lowest odds of illness remission. It’s interesting to see that Lactobacillaceae is on the rise because these bacteria are frequently found in probiotics and have been linked to anti-inflammatory and health-promoting benefits [160 (Naidu AS, 1999)]. According to human investigations, Lachnospiraceae, Akkermansia, and Sutterella levels were different in patients taking either risperidone or olanzapine compared to controls [161 (Flowers SA, 2017;)]. The scant evidence supporting probiotics’ effectiveness in treating schizophrenia was brought to light by a comprehensive study [162 (Ng Q, 2019)]. To fully comprehend the use of GM modification in the treatment of schizophrenia, more research will be required.

Discussion

Had we ever questioned why the world of emotions may revolve around food? Why do we spend so much time viewing culinary videos without even recognising it? Why do we often feel famished or have watery mouths and a calm energy when we see any delectable dish? How is new age culinary streaming gaining so much popularity? What could be the cause of individuals criticizing certain restaurants because they see other people eat or are dining in public? Either the person or the action you are watching tends to be in focus. If the second option is chosen, is watching others eat today so fascinating that people spend countless hours doing it?The interaction between the gut and the mind is crucial to consider when trying to understand human behavior like this. Food not only gives the body nourishment, but it also gives the brain the proper stimuli for a healthy mind. It’s a little strange to assume that food has the power to make or destroy both your intellect and you. One of our body’s most important and intelligent organs is the brain. If you don’t have control over your thoughts, they will begin to rule you. Therefore, it is also preferable to feed your brain in the manner in which you desire it to function; the simplest choice is food. Not only through consuming nutritious food but also by observing how it is prepared and presented. Does the person preparing your food put positive energy into it, which will then be absorbed by us when we eat it? Now you see why everyone simply adores their mother’s cooking—it is because, more than any of the ingredients, love and care have been transmitted through it. Almost everyone once in a lifetime encounters living alone, and it’s at such moments that we discover the effects cooking can have on us. It’s difficult to return home empty-handed after spending hours grocery shopping, especially if you only want to buy one item. To organize your groceries before returning home, to find your pantry full, and to feel content. Cooking your own food, plating it, sitting down to enjoy it, feeling accomplished, relieving yourself of all the day’s tension, and going to bed with a full stomach and a contented mind.

Similar to an engine consuming gasoline, our bodies function as machines thanks to the energy they receive from food. The food we consume for nutrition serves as a fuel for the mitochondria to produce energy. Oxygen and food-derived glucose interact to produce energy, carbon dioxide, and water molecules. Our body creates the energy needed to keep the heart beating, the lungs breathing, and the limbs moving by using the food we eat. In order to create muscle, we work out hard in the gym, which requires protein. Therefore, the advice from the gym instructors is to take those nutrients and eat a high-calorie diet. To achieve this goal, it is advised to consume protein-rich meals like lentils, milk, eggs, vitamin-rich vegetables, and meat in order to assist the body develop enough muscles.

Proteins in the meal offer amino acids for digestion. These amino acids play a range of activities, from assisting metabolism to safeguarding our heart, in the construction of proteins. The macronutrients that are essential for maintaining life, proteins help to form body tissues like cells and organs. When you are low on carbohydrates and fats, your body can also use amino acids as fuel. When we are ill, we take food and medicine to get better. If we eat enough food, our immunity increases and we experience a noticeable reduction in coughing and cold-like symptoms. Patients become extremely weak even in the majority of infections, ailments, or illnesses because they have stopped eating or are reluctant to do so.
Nutrition deficit is a type of illness where the disorder is brought on by either too little or too much food.

Inadequate nutrition combined with the use of medications causes a variety of issues, including drug buildup and the emergence of microbial drug resistance. This is due to the food’s ability to trigger enzymes. Drugs are thus made more water-soluble by metabolism and eliminated through urine. Food gives the body the strength it needs to safely metabolize drugs and medicines after they have taken effect in the body. Many oil-soluble medications are well absorbed when fatty foods . As frequently heard, the Korean recipe for beautiful skin, the Japanese secret of powerful muscles, etc. But have we ever questioned why such objective truths may be applied to a group as a whole and are almost universal? Something must be consumed by everyone and produce comparable outcomes for there to be such widespread similarity. For instance, a large portion of the Korean diet consists of rice, which contributes to their healthier skin and hair quality. This is now recognised globally, and eating rice in a similar manner has the desired effects. The prevalence of cognitive disorders in old age can be reduced by instilling strong morals in children and by educating them about the variety of foods available and the range of health benefits each one offers. Making it a habit, for instance, for your child to eat four soaked walnuts every day first thing in the morning may delay any age-related cognitive illnesses as well as any degeneration in the present.

We conclude by showing how various food categories, such as fruits, nuts, vegetables, beverages, and so forth, affect our cognitive behavior when consumed on a regular basis. The amount consumed depends on a variety of variables, including age, location, eating habits, how a particular food affects the brain-gut axis, and changes in gut bacteria. Additionally, the effect of nutrition might be seen as an environmental element in the development of SZ. A larger cohort study will be required in the future to investigate the various facets of food in the SZ spectrum.

Normal people who are approaching old age or who are in their 60s tend to have a box full of medications that they must take every day and are non-negotiable. Low energy and the sense of being unable to do anything can combine to make old age painful and not joyful as it would have been for someone before they reached their 60s. What would it feel like to be someone who has always been upbeat, healthy, and fine—smiling, having fun, and being the life of the party—instead? How would it make you feel? terrifying, huh? Why do some people experience that?simply old? Is being reliant on certain drugs to get through the day because of your age justified? No, absolutely not. Instead, make some lifestyle adjustments with one very crucial principle in mind: you should never skip meals, whether you’re feeling well or not. Simply being cautious and altering your lifestyle to give more importance to your eating habits—from choosing what to eat, incorporating important food types according to your body, to cooking and enjoying it—can make your life change in such a way that, regardless of your personal circumstances, you can always lead a high-quality life and maintain a positive outlook on life.Spreading and instilling in the next generation the value of learning about food consumption as a whole will increase their life expectancy as well as their quality of life, professional productivity, and ability to manage stress. A healthy gut also contributes to a healthy brain, which in turn improves overall health.

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Figures

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About the author

Kajal Gupta

Kajal has a strong love for research and is incredibly fascinated about various issues in the health sector that require answers in order to keep up with the expanding global population.

The post The Gutsy Brain Or The Brain Of Your Gut : Food For Brain appeared first on Exploratio Journal.

Abstract

Breast cancer is the second most common type of cancer that afflicts women across the globe. The likelihood of developing breast cancer increases should the individual inherit mutated genes from their parent(s). In this short review, we focus on various mutated genes that have been linked to hereditary breast cancer and the potential risks of having these genes. We also discuss the screening, prevention, and treatment of breast cancer from inherited genetic mutations. It is thus critical in understanding the different mechanisms by which hereditary breast cancer is developed to better manage and treat this disease.

Introduction

Breast cancer is the malignant proliferation of epithelial cells that typically begin in the ducts or lobules of the breast. Breast cancer is the second most common cancer among women in the United States, after skin cancer. About 1 in 8 women will develop invasive breast cancer in their lifetime. Over the past decades, new cases of female breast cancer have steadily increased (Figure 1). Men are also susceptible to breast cancer, making up less than 1% of all breast cancer cases. Symptoms of breast cancer vary from person to person and some may not have any symptoms at all. The most common symptoms of breast cancer include a new lump in the breast, thickening or swelling of the breast, breast skin irritation, redness or flaky skin, change in breast size or shape, and pain in the breast (Katsura et al., 2022).

There are a number of risk factors associated with breast cancer with gender being the most significant. While men and women alike can develop breast cancer, the risk is elevated in women due to the constant changes and growth in women’s breast cells. The second most significant risk factor for breast cancer is age, as most breast cancers are diagnosed in women after the age of 50. This is due to the increased likelihood of abnormal changes in older women’s cells. A family history of breast cancer is another risk factor (Łukasiewicz et al., 2021). Women who have been pregnant after thirty, did not breastfeed, or have never had a full-term pregnancy have an increased risk for breast cancer as well. In addition, the level of physical activity, weight, and alcohol consumption also play a role.

Several treatment options are available for breast cancer and patients often receive more than one. Surgery can remove as much of the solid cancer as possible. Chemotherapy uses anti-cancer medicine that is injected or ingested to reach cancer cells. These drugs kill the cancer cells, reducing tumor size and sometimes completely eliminating it. For some types of breast cancer, hormones promote their proliferation by interacting with hormone receptors on the surface of the cancer cell. Targeted therapies block hormones from attaching to these specific receptors, thus leading to slow proliferation of the cancer and potentially killing it. Radiation therapy uses high- energy rays to destroy cancer cells. While there are many treatment options, the success rates of these treatments vary with each patient. It is thus critical to focus on the underlying differences between the various tumors to understand how to develop more targeted treatments.

Genes Related to Hereditary Breast Cancer

Deoxyribonucleic acid (DNA) mutations, which are random or induced changes in DNA sequence, are the universal cause of all cancers. Each cancer has a unique combination of genetic changes. These variations in the DNA sequence of healthy breast cells, known as acquired or somatic genetic mutations, may lead to breast cancer. Such somatic gene mutations, which may be caused by radiation or cancer-inducing chemicals, are acquired during a person’s lifetime and occur only in breast cancer cells. Although most gene mutations linked to breast cancer are acquired, about 10% of breast cancers are inherited from parents. Inherited DNA alterations are called germline mutations and are present in every cell in the body.

A number of germline gene mutations have been linked to hereditary breast cancer (Table 1). These genes are classified as of high, medium, or low penetrance according to their relative risk ratios for breast cancer. BReast CAncer gene 1 (BRCA1) and 2 (BRCA2) are the most common mutated genes that are inherited. Both BRCA1 and BRCA2 are tumor suppressor genes that encode for proteins responsible for controlling cell growth and death (Lee et al., 2020). In the nucleus, the BRCA proteins interact with other proteins to repair breaks in DNA, maintaining the stability of a cell’s genetic information. Inherited BRCA1 and BRCA2 gene mutations lead to the production of an abnormal variant of their proteins or decreased production of the protein, reducing the amount available to repair damaged DNA. When these genetic defects accumulate, they trigger cells to grow and divide uncontrollably, forming cancers. Mutations in these genes are transmitted by autosomal dominant inheritance in a family. It is important to note that the parents who pass the gene mutations to their offspring are not necessarily cancer patients. Likewise, a mother who has breast cancer does not necessarily pass that cancer to their offspring. Having a BRCA1 or BRCA2 mutation markedly increases the risk of developing breast cancer, especially early onset breast cancer, and an increased incidence of cancers in other organs. Approximately 6% of breast cancer cases are caused by pathogenic variants in these genes (Couch et al., 2017). Women with an inherited mutation in BRCA1 have about 55-70% lifetime risk of developing breast cancer. A mutation in BRCA2 increases that risk by 45-70% (Couch et al., 2017).

Hereditary breast cancer can also be caused by other less common germline gene mutations. Ataxia Telangiectasia Mutated (ATM) gene, when functioning properly, helps cells by fixing damaged DNA or by killing cancerous cells (Stucci et al., 2021). Inheriting an abnormal copy of the gene has been linked to an increased rate of breast cancer, especially in women over the age of 50. It is usually associated with an autosomal recessive condition that is characterized by a lack of muscle coordination and predisposition to certain cancers. Partner and localizer of BRCA2 (PALB2) is a gene that produces a BRCA2 interacting protein. Mutations in the PALB2 gene increase the risk of developing breast cancer. Some studies have found that germline mutations of PALB2 exist in families with breast cancer. Tumor protein p53 (TP53) gene encodes for tumor protein p53 which is often known as the guardian of the genome because it helps terminate the growth of cells with damaged DNA and suppresses tumor growth. Tumors with germline TP53 mutations tend to have a poorer prognosis. They are more likely to be aggressive, to be resistant to certain anti-cancer drugs and radiation, and to recur after treatment. TP53 mutation carriers with breast cancer who receive radiation therapy are at increased risk for developing secondary cancer in radiation fields (Masciari et al., 2012). The Checkpoint Kinase (CHEK2) gene is also involved in DNA repair and increases breast cancer risk when a mutation is inherited. The Phosphatase and Tensin Homolog (PTEN) gene provides instructions for making an enzyme that acts as a tumor suppressor and regulates cell growth. Inherited mutations in PTEN gene can result in Cowden syndrome, putting victims at higher risk for both malignant and benign tumors of the breasts. Females with Cowden syndrome have a 25-50% lifetime risk of developing breast cancer. The serine/threonine kinase 11 gene (STK11) is a tumor suppressor that helps cells orient themselves and promotes apoptosis (programmed cell death). Defects in STK11 gene can lead to Peutz-Jeghers syndrome with a higher risk for many types of cancer, including breast cancer. The E-cadherin gene (CDH1) encodes a protein called epithelial cadherin or E-cadherin. E-cadherin plays a key role in cell adhesion. A lack of E-cadherin makes it easier for cancer cells to detach from a primary tumor and spread to other parts of the body. E- cadherin also acts as a tumor suppressor protein preventing cells from growing and dividing too rapidly. Inherited mutations in CDH1 gene increase a woman’s risk of developing a form of breast cancer that begins in the milk-producing glands called lobular breast cancer. The cumulative lifetime risk is 50% to 60%, mostly before age 40 (Benusiglio et al., 2013).

Clinical Implications

Genetic counseling and testing helps identify those individuals at increased risk for breast cancer due to germline gene mutations. These include but are not limited to: being diagnosed with breast cancer at a younger age (before age 45), having triple-negative breast cancer (TNBC, a type of breast cancer that grows quickly), having been diagnosed with a second breast cancer, being of Ashkenazi Jewish descent, and having a family history of breast, ovarian, pancreatic, or prostate cancers. Most patients are offered multigene panel testing, using blood, saliva, or buccal mucosa.

Once a positive germline gene mutation is identified, cancer screening such as mammogram and breast magnetic resonance imaging (MRI) are recommended to diagnose early stage breast cancer (Tung et al., 2020). For average-risk women, breast cancer screening with mammography starts at age 50. However, for women with germline pathogenic gene variant, guidelines recommend annual mammography beginning at age 30 and MRI at age 25 or earlier, depending on the earliest age of breast cancer in the family (Saslow et al., 2007). Periodic self-breast examination from age 18 and clinical breast examination from age 25 may facilitate awareness of breast changes in these women.

Germline gene mutations affect breast cancer cell biology and behavior. About 80% of all breast cancers over-express estrogen receptor (ER) and they respond to anti-estrogen treatment 30-70% of the time. Increased expression of human epidermal growth factor receptor 2 (HER2) occurs in 25% human breast cancer cells, which is the target of anti-HER2 therapy such as trastuzumab (a monoclonal antibody). Around 15% of breast cancers lack expression of ER, progesterone receptor, and HER2, the so-called TNBC. However, around 65% and 30% breast cancers from BRCA1 and BRCA2 germline mutations respectively are triple negative (Gonzalez-Angulo et al., 2011). TNBC tends to behave more aggressively than other types of breast cancer, and there are no approved targeted treatments available. Due to the strong association of BRCA germline mutation with TNBC, patients with triple-negative disease should undergo BRCA mutation testing regardless of family history.

Breast-conserving surgery (lumpectomy) — removing the cancer but not the breast itself — is the preferred surgical treatment for early-stage breast cancer. However, patients with breast cancer due to germline BRCA1 or BRCA2 mutation have a poorer response to lumpectomy. An analysis of 10 studies of lumpectomy demonstrated a higher risk for ipsilateral (same side) breast cancer recurrence at a follow-up of 7 years in germline BRCA1 or BRCA2 mutation carriers compared to non-carriers. The risk for contralateral (opposite side) breast cancer recurrence in BRCA1 or BRCA2 mutation carriers is also increased (Tung et al., 2018). Carriers of a germline TP53 mutation, however, are recommended to undergo mastectomy. This is to avoid the need for subsequent breast radiotherapy which may cause secondary cancer in the radiation field (Schon et al., 2018).

For women who have a BRCA1/2 pathogenic variant, prophylactic bilateral mastectomy surgery, a procedure that removes the breasts, reduces the risk of developing breast cancer by 90% (van Roosmalen et al., 2004). Because breast cancer is a hormone-dependent disease, removing the ovaries, the main source of estrogen and progesterone, is also an option for breast cancer prophylaxis. However, such surgery (bilateral salpingo-oophorectomy) reduces the risk of breast cancer only in BRCA2 carriers but not in BRCA1 carriers. This can be explained by the fact that BRCA2-associated tumors are more likely than BRCA1-associated tumors to be ER positive. For female BRCA2 carriers who opt against mastectomies, medicines such as tamoxifen (selective ER modulator) or aromatase inhibitors (which reduces estrogen production from estrogen precursors) can be used to lower breast cancer risk by blocking estrogen effect in breast tissue. Tamoxifen reduces breast cancer risk by 62% in BRCA2 carriers, but not in BRCA1 carriers (King et al., 2001). Women with CHEK2 mutations are more likely to develop ER-positive breast cancers and thus may be good candidates for chemoprevention with tamoxifen.

Breast cancers caused by germline BRCA gene mutations are particularly sensitive to certain anti-cancer medications such as platinum-based chemotherapeutic agents and poly (adenosine diphosphate-ribose) polymerase (PARP) inhibitor (Bryant et al., 2005). Platinum agents form covalent crosslinks in the DNA. Breast cancer cells lacking functional BRCA1 or BRCA2 are unable to repair this damage. Clinical trials have shown that patients with advanced or metastatic breast cancer associated with germline BRCA1/2 mutations have high response rates to cisplatin and carboplatin (Bhattacharyya et al., 2000). PARP is essential for repairing DNA damage. When the PARP pathway is inhibited, double-strand DNA breaks accumulate. This should be repaired by the BRCA pathway-dependent homologous recombination mechanism under normal conditions (Tentori et al., 2005). Inhibition of PARP in tumors lacking BRCA function would lead to cancer cell death. Olaparib, a PARP inhibitor, has been approved by the United States Food and Drug Administration for the treatment of germline BRCA-mutated breast cancer. Clinical trials have demonstrated improved efficacy and fewer side effects with such treatment.

Conclusion

Carriers of germline breast cancer gene mutations, predominantly BRCA1 or BRCA2, are at high risk of developing breast cancer. Genetic testing is recommended for at-risk groups after genetic counseling. Detecting such gene mutations will identify those who will benefit from breast cancer screening starting at an early age. Germline breast cancer gene mutations affect cancer cell phenotype and biology, leading to suboptimal response to certain medications. In such patients, breast-conserving surgery is associated with increased ipsilateral and contralateral recurrence, while prophylactic bilateral mastectomy significantly reduces breast cancer risks. Estrogen receptor modulators are less effective alternatives. Bilateral salpingo-oophorectomy could be considered in selected population. Platinum-based chemotherapeutic agents and PARP inhibitor are more effective in breast cancer due to BRCA germline mutations. A critical path forward in physicians’ decisions for diagnosing and treating breast cancer should integrate genetic information.

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About the author

Danna Cai

Danna is a rising sophomore at Friendswood High School. She is interested in oncology and aspires to go into the medical field. She plays tennis competitively and loves music. Danna enjoys volunteering in tutoring math, the pediatrics unit of her local hospital, and at her local food bank. She hopes to help spread awareness in cancer prevention and wishes to continue researching cancers that affect women around the globe.

The post A Review on Hereditary Breast Cancer appeared first on Exploratio Journal.