Explore how nutrition affects mental health, the connection between diet and brain function, and tips for eating to improve mood, cognition.
How Nutrition Affects Mental Health: Evidence-Based Guide to Brain Function, Mood & Diet
A balanced dietary pattern can provide nutrients involved in brain function, energy metabolism and overall wellbeing.
Featured Snippet: How Does Nutrition Affect Mental Health?
Nutrition influences mental health by supplying the energy, amino acids, fatty acids, vitamins and minerals required for normal brain function. Dietary patterns also influence inflammation, cardiovascular health, blood-glucose regulation and the gut microbiome, which communicates with the nervous system through immune, hormonal, metabolic and neural pathways. Research increasingly associates healthier dietary patterns, particularly Mediterranean-style and other minimally processed, plant-rich diets, with better mental-health outcomes. However, evidence is stronger for nutrition as part of a broader approach than for diet as a standalone treatment for psychiatric disorders.
Why Nutrition Matters for Mental Health
Mental health is shaped by a combination of biological, psychological, social and environmental factors. Nutrition is only one part of that picture, but it is an important and modifiable part. The brain requires a continuous supply of energy and nutrients to maintain neuronal membranes, produce cellular energy, regulate signaling pathways and support normal cognitive and emotional function.
The global burden of mental disorders makes this relationship especially important. The World Health Organization reports that nearly one in seven people worldwide lives with a mental disorder. Depression alone affects hundreds of millions of people worldwide. These conditions are complex and cannot be explained by diet alone, but their scale has increased interest in prevention strategies that can complement established psychological and medical care.
The field commonly described as nutritional psychiatry examines how dietary intake and dietary patterns interact with brain biology. Researchers are investigating pathways involving inflammation, oxidative stress, mitochondrial energy production, the hypothalamic–pituitary–adrenal stress system, neurotransmitter metabolism and the gut microbiome.
The important distinction is that nutrition should not be treated as a simplistic cure for mental illness. A person can eat an excellent diet and still develop depression, anxiety or another psychiatric disorder. Conversely, improving dietary quality may provide meaningful support for energy, sleep, metabolic health and emotional wellbeing and may improve outcomes when incorporated into a broader treatment plan.
What Is Nutritional Psychiatry?
Nutritional psychiatry is an emerging interdisciplinary area that investigates how food, nutrients and dietary patterns affect psychological and neurological health. It overlaps with neuroscience, nutrition science, gastroenterology, immunology, endocrinology and psychiatry.
Rather than asking whether one food “cures” depression, nutritional psychiatry asks more useful questions: Does a dietary pattern provide adequate nutrients for brain function? Does it support metabolic and cardiovascular health? Does it influence inflammatory signaling? Does it promote a diverse and metabolically active gut microbiome? And, importantly, do controlled human studies demonstrate meaningful improvements in clinical outcomes?
This distinction matters because many nutrition claims are based on laboratory experiments, animal studies or observational research. Those studies can reveal plausible mechanisms, but they cannot automatically demonstrate that changing one food will prevent or treat a mental-health condition in humans.
Why the Brain Depends on Nutrition
The brain is metabolically demanding tissue. Although it represents only a small proportion of body mass, it consumes a substantial share of the body's energy at rest. Neurons require continuous energy for maintaining electrical gradients, communicating with one another, repairing cellular structures and adapting to new information.
Carbohydrate is an important source of glucose for the brain under ordinary physiological conditions. Protein supplies amino acids used in many biological processes, including neurotransmitter synthesis and tissue maintenance. Dietary fats provide fatty acids that contribute to cell membranes and signaling pathways, while vitamins and minerals act as cofactors in hundreds of biochemical reactions.
This is one reason overall dietary quality matters more than a narrow focus on individual “brain foods.” A diet can contain one nutrient-rich food while still being inadequate overall if it lacks sufficient protein, fiber, micronutrients or dietary variety.
| Nutritional component | Why the brain needs it | Food examples |
|---|---|---|
| Protein | Provides amino acids used in neurotransmitter production and cellular maintenance. | Eggs, fish, beans, lentils, dairy, poultry |
| Omega-3 fats | Support neuronal membranes and signaling pathways. | Sardines, mackerel, salmon, chia, flaxseed, walnuts |
| Complex carbohydrates | Provide glucose and dietary fiber for energy and metabolic health. | Oats, whole maize, millet, brown rice, whole grains |
| B vitamins | Support energy metabolism, DNA synthesis and nervous-system function. | Legumes, leafy greens, eggs, meat, fortified foods |
| Magnesium | Participates in numerous enzymatic reactions and neuronal processes. | Seeds, nuts, beans, leafy greens, whole grains |
| Iron | Supports oxygen transport and cellular energy production. | Meat, legumes, leafy greens, fortified foods |
| Zinc | Contributes to cellular signaling, immune function and neurological processes. | Meat, seafood, legumes, seeds, nuts |
Nutrition and Neurotransmitters
Neurotransmitters are chemical messengers that allow nerve cells to communicate. They participate in processes involving mood, motivation, sleep, appetite, attention, learning and stress responses.
Food does not simply translate directly into a particular emotional state. However, nutrients obtained through the diet contribute to the biochemical pathways through which neurotransmitters are produced and regulated.
Serotonin
Serotonin is involved in mood, appetite, sleep and gastrointestinal function. Its synthesis begins with the amino acid tryptophan. Tryptophan is found in foods such as eggs, dairy products, poultry, fish, legumes, nuts and seeds.
An important clarification is that serotonin produced in the digestive tract does not simply cross into the brain and increase brain serotonin. Most peripheral serotonin is produced outside the brain, while central serotonin is synthesized within the nervous system. Nevertheless, the gut and brain communicate through multiple biological pathways, making gut physiology relevant to neurological function.
Dopamine
Dopamine participates in motivation, movement, learning, attention and reward processing. Its production involves the amino acid tyrosine, which can be obtained from protein-rich foods including fish, poultry, dairy products, eggs, soy and legumes.
It is misleading to assume that eating a particular food will directly “raise dopamine” enough to treat depression or improve motivation. Dopamine function depends on complex neural circuits, receptor activity, genetics, sleep, stress and many other factors in addition to nutrient availability.
GABA
Gamma-aminobutyric acid, commonly abbreviated as GABA, is the principal inhibitory neurotransmitter in the central nervous system. It helps regulate neuronal excitability.
Vitamin B6 is involved in the biochemical conversion required for GABA synthesis. Magnesium also participates in neurological processes relevant to neuronal signaling. However, evidence that simply consuming large amounts of these nutrients produces clinically meaningful anxiety relief in otherwise well-nourished individuals remains limited.
Key Nutrients for Brain and Mental Health
A nutritionally adequate diet supplies many compounds involved in brain function. The following nutrients are particularly relevant because deficiencies can impair neurological function, while adequate intake supports normal physiological processes.
Omega-3 Fatty Acids
EPA and DHA are long-chain omega-3 fatty acids with important biological functions. DHA is a structural component of neuronal membranes, while EPA participates in lipid signaling and inflammatory regulation.
Observational studies frequently associate greater fish consumption with better mental-health outcomes. Clinical trials of omega-3 supplementation in depression have produced mixed results, although some evidence suggests EPA-containing formulations may provide modest benefits for certain people when used alongside conventional treatment.
For practical dietary guidance, the NIH Office of Dietary Supplements explains the biological functions, dietary sources and evidence surrounding omega-3 fatty acids.
Good food sources include sardines, mackerel, salmon, trout, chia seeds, flaxseed and walnuts.
B Vitamins
Several B vitamins are important for neurological function. Folate and vitamin B12 participate in one-carbon metabolism and DNA synthesis, while vitamin B6 contributes to neurotransmitter synthesis.
Vitamin B12 deficiency is particularly important because prolonged deficiency can cause neurological abnormalities as well as anemia. People who consume little or no animal-derived food may need reliable sources of B12 from fortified foods or supplements, depending on their dietary pattern and individual circumstances.
Folate
Folate is naturally present in foods such as leafy green vegetables, beans, peas, lentils, asparagus and some fruits. It is essential for DNA synthesis and normal cell division and participates in biochemical pathways relevant to neurological function.
Low folate status has been associated with depression in observational research. However, association does not mean that taking high-dose folic acid will prevent or cure depression in everyone.
Magnesium
Magnesium participates in hundreds of enzymatic reactions and contributes to nerve and muscle function, energy metabolism and normal cellular signaling.
Useful dietary sources include pumpkin seeds, almonds, cashews, beans, whole grains and dark leafy vegetables. A varied diet generally provides magnesium without requiring supplementation.
Vitamin D
Vitamin D has important roles in calcium metabolism, bone health, immune regulation and gene expression. Vitamin D receptors are also found in the nervous system.
Low vitamin D status is associated with depression in observational studies. However, randomized trials have not consistently demonstrated that vitamin D supplementation prevents or treats depression in people who are not deficient. Testing and treatment decisions should therefore be based on individual circumstances rather than the assumption that more vitamin D is always better.
Iron
Iron is required for hemoglobin production and oxygen transport, but it also participates in cellular energy metabolism and neurological development.
Iron deficiency can contribute to fatigue and impaired cognitive performance. People with heavy menstrual bleeding, pregnancy, certain gastrointestinal disorders or diets with limited iron sources may be at increased risk.
Iron supplements should not be taken indiscriminately because excessive iron can also be harmful. The NIH provides detailed information about iron requirements, dietary sources and deficiency.
Zinc
Zinc supports immune function, DNA synthesis, protein metabolism and numerous neurological processes. Good dietary sources include meat, seafood, beans, nuts and seeds.
Zinc deficiency is more concerning than simply having a diet that is not “high in zinc.” Excessive supplementation can interfere with copper absorption and cause adverse effects, so food-first approaches are preferable for most people.
Antioxidant-Rich Foods
The brain is vulnerable to oxidative stress because of its high metabolic activity and the abundance of easily oxidized lipids in neural tissue. Foods containing vitamin C, vitamin E, carotenoids and polyphenols contribute to the body's overall antioxidant network.
Rather than searching for a single antioxidant “superfood,” a better strategy is to consume a broad variety of colorful vegetables, fruits, legumes, nuts, seeds and whole grains.
Key Takeaways
- The overall dietary pattern matters more than any single food.
- Protein, omega-3 fats, B vitamins, magnesium, iron, zinc and other nutrients contribute to normal neurological function.
- Correcting a genuine nutritional deficiency can be important for neurological and psychological wellbeing.
- Supplements are not automatically better than food and can be harmful when taken in excessive amounts.
- Nutrition can support mental-health treatment but should not replace professional care for depression, anxiety or other psychiatric conditions.
The Gut–Brain Axis: How Digestive Health Connects With the Brain
The gut and brain communicate continuously through what researchers call the gut–brain axis. This is a two-way communication network involving the nervous system, immune system, endocrine signaling and microbial metabolites.
The vagus nerve is one component of this system, but it is not the entire explanation. Signals also travel through circulating hormones, immune mediators and metabolites produced by intestinal microorganisms.
The Gut Microbiome
The gut microbiome consists of a large community of microorganisms living primarily within the digestive tract. These organisms help metabolize components of food, interact with the immune system and produce metabolites that can influence physiological processes.
Diet is one of several factors shaping the microbiome. Antibiotic exposure, age, illness, physical activity, sleep and other lifestyle factors also influence microbial communities.
Fiber and the Microbiome
Dietary fiber provides fermentable substrates for many gut microorganisms. Fermentation can produce short-chain fatty acids such as acetate, propionate and butyrate, which have important effects on intestinal and metabolic physiology.
For this reason, eating a variety of plant foods is a practical way to support the gut ecosystem. Beans, lentils, oats, whole grains, vegetables, fruits, nuts and seeds are particularly useful sources of dietary fiber.
Fermented Foods
Foods such as plain yogurt containing live cultures, kefir and traditionally fermented vegetables can contribute microorganisms and fermentation products to the diet.
However, fermented foods should not be portrayed as guaranteed treatments for anxiety or depression. Research into probiotics and mental health is promising but still developing, and effects may depend on the specific microbial strain, dose, health status and outcome being measured.
Foods and Dietary Patterns to Prioritize for Mental Health
The strongest practical lesson from nutritional psychiatry is not that one food possesses extraordinary psychological powers. It is that dietary patterns matter. A nutrient-dense diet provides a broader range of compounds that work together to support cardiovascular health, metabolic regulation, gastrointestinal function and normal brain physiology.
The Mediterranean-Style Pattern
Among dietary patterns studied in relation to mental health, the Mediterranean-style pattern has received considerable attention. It emphasizes vegetables, fruits, legumes, whole grains, nuts, seeds, fish and unsaturated fats while limiting highly processed foods and excessive intake of processed meat and added sugars.
The SMILES randomized controlled trial investigated whether improving diet could improve depressive symptoms. Participants assigned to dietary support experienced greater improvement in depressive symptoms than those assigned to a social-support control condition. The study was important because it moved beyond observational associations, although it was relatively small and does not establish that diet alone treats depression.
The trial is discussed in The Lancet Psychiatry.
Adapting Brain-Healthy Eating to East African Foods
Healthy nutrition does not require expensive imported “superfoods.” A brain-supportive eating pattern can be built around locally available foods. In Kenya and other East African settings, meals can include beans, lentils, green vegetables, whole maize, millet, sorghum, groundnuts, avocado, eggs, fermented milk, fruits and locally available fish.
For example, a meal of beans, vegetables and whole maize provides protein, complex carbohydrate, fiber and multiple micronutrients. Adding an avocado or a modest amount of another unsaturated-fat source can further increase dietary variety.
This food-first approach is generally more practical and sustainable than attempting to reproduce an expensive Western “wellness” diet.
Foods and Dietary Patterns to Limit
A healthy mental-health diet is not defined by a rigid list of forbidden foods. Occasional sweets, fried foods or highly processed meals do not automatically cause depression or anxiety. The more meaningful issue is the overall dietary pattern and how frequently nutrient-poor foods displace nutrient-dense foods.
Ultra-Processed Foods
Ultra-processed foods include many packaged snacks, sweetened beverages, processed meats, confectionery products and ready-to-eat industrial formulations. Many are energy-dense while providing relatively little fiber and micronutrient diversity.
Large observational studies have associated higher ultra-processed-food consumption with several adverse health outcomes, including depression. However, observational studies cannot prove that ultra-processed foods directly cause depression because dietary behavior is connected with socioeconomic factors, physical activity, sleep, stress and other variables.
A BMJ umbrella review examined evidence on ultra-processed foods and multiple health outcomes.
Excess Added Sugar
High intake of added sugars can contribute to excess calorie intake, dental disease and metabolic problems. Large amounts of sugary drinks and sweets can also displace foods that would otherwise provide protein, fiber and micronutrients.
Rather than treating sugar as a direct cause of depression, it is more accurate to say that diets high in added sugars often form part of lower-quality dietary patterns associated with poorer health outcomes.
Highly Refined Carbohydrates
Refined grains such as white bread and highly processed snack foods are rapidly digested compared with many intact or minimally processed carbohydrate sources. The effect on blood glucose depends on the food, portion size and what is eaten alongside it.
A practical approach is not necessarily to eliminate refined carbohydrates, but to increase whole grains, legumes, vegetables and other high-fiber foods while reducing heavily processed alternatives.
Excessive Alcohol
Alcohol affects the central nervous system and can disrupt sleep, mood regulation and judgment. Heavy or frequent alcohol consumption is associated with increased risk of several mental-health problems and can worsen existing symptoms.
For people who drink alcohol, reducing consumption can be an important part of improving overall health. For some individuals, particularly those with alcohol-use disorder or certain medical conditions, avoiding alcohol altogether may be appropriate.
Trans Fats and Excessively Fried Foods
Industrial trans fats are particularly harmful to cardiovascular health and should be minimized. Excessive consumption of fried foods can also increase overall energy intake and may contribute to a dietary pattern low in vegetables, fiber and micronutrients.
Practical Nutrition Strategies for Better Mental Health
Knowing which nutrients matter is useful, but the real challenge is translating nutritional science into everyday behavior. The most sustainable strategy is to improve the overall quality of meals gradually rather than attempting a dramatic diet overhaul.
1. Build Balanced Meals
Aim to combine a protein source, a high-fiber carbohydrate or plant food, vegetables or fruit, and a source of healthy fat when appropriate. This combination increases nutrient density and can improve satiety.
For example, beans with whole maize and vegetables creates a substantially different nutritional profile from a meal dominated by refined starch and sugary drinks.
2. Increase Dietary Variety
Eating the same small group of foods every day can limit nutritional diversity. Rotate vegetables, fruits, legumes, grains, nuts, seeds and protein sources throughout the week.
Variety also provides different forms of fiber and plant compounds that interact with the gut microbiome.
3. Eat More Fiber-Rich Foods
Adults generally benefit from adequate dietary fiber, although exact needs vary. Beans, lentils, oats, whole grains, fruits, vegetables, nuts and seeds make it easier to increase fiber without relying on supplements.
Increase fiber gradually and drink adequate fluids, especially if your usual diet is low in fiber.
4. Include Omega-3 Sources
If you eat fish, include oily fish such as sardines or mackerel regularly. Plant foods such as chia, flaxseed and walnuts provide alpha-linolenic acid, another omega-3 fatty acid.
5. Stay Adequately Hydrated
Water is essential for normal physiological function. Dehydration can contribute to headaches, fatigue and impaired concentration. Instead of focusing on an arbitrary universal water target, drink regularly and increase fluid intake when environmental heat, exercise or illness increases fluid requirements.
6. Do Not Skip Food Groups Without a Reason
Highly restrictive diets can make it harder to meet nutritional requirements. If you eliminate animal products, grains, dairy or other major food groups, plan carefully to ensure adequate protein, vitamin B12, iron, calcium, iodine, omega-3 fatty acids or other relevant nutrients.
7. Prepare Food in Advance
Meal preparation reduces reliance on convenience foods when you are tired or busy. Keeping cooked beans, vegetables, whole grains, eggs, fruit and other simple foods available can make healthier choices easier.
8. Avoid the “Perfect Diet” Mindset
Mental health itself can be negatively affected by excessive dietary restriction and food-related anxiety. A sustainable diet should allow flexibility and cultural preferences while maintaining an overall nutrient-dense pattern.
Example of a Brain-Supportive Day of Eating
The following is an example rather than a medical prescription. Portion sizes should be adapted to age, body size, activity level, health status, cultural preferences and individual energy needs.
Breakfast
- Oats or millet porridge
- Eggs or plain yogurt
- Banana or another fruit
- A small serving of nuts or seeds
Lunch
- Beans, lentils, eggs or fish
- Sukuma wiki or another leafy vegetable
- Whole maize, brown rice, millet or another whole-grain carbohydrate
- Fruit
Snack
- Fruit
- Plain yogurt
- Groundnuts, seeds or another unsalted nut
Dinner
- Fish, beans, lentils, eggs or another protein source
- Mixed vegetables
- A moderate portion of whole-grain or minimally processed carbohydrate
- Avocado or another source of unsaturated fat if appropriate
Explore More Health Topics
You may also find these related health resources useful:
Learn more about nutrition and lifestyle , including healthy eating, practical nutrition choices, and everyday habits that can support overall well-being.
For information about common health conditions and ways to reduce preventable risks, explore our diseases and prevention resources.
You can also explore family and personal health topics covering reproductive health, family wellness, and everyday health concerns.
If you are interested in becoming more physically active, visit our fitness and exercise section for practical information about movement, workouts, and physical fitness.
For guidance related to stress, emotional well-being, and other aspects of psychological wellness, explore mental health and well-being .
You can also browse our preventive health resources for information about prevention, screening, healthy habits, and long-term health.
If you are looking for practical meal ideas, visit our healthy recipes section for nutritious meals and simple recipe ideas.
For a broader collection of articles, browse the complete VitalWell Hub Health Topics library.
These resources provide general health information and are not a substitute for individualized medical advice.
What the Evidence Does—and Does Not—Prove
Nutrition research is often presented online with more certainty than the evidence warrants. Understanding the limitations of the science is essential when discussing mental health.
Association Is Not Causation
If people who eat more vegetables have lower rates of depression, that does not prove vegetables independently prevent depression. People who consume healthier diets may also have greater access to healthcare, exercise more, sleep better, smoke less and experience different socioeconomic conditions.
Deficiency Is Different From Optimization
Correcting a nutritional deficiency can produce significant health benefits. This does not mean that taking additional amounts of a nutrient above adequate levels will continue producing benefits.
Supplements Are Not Automatically Better
Supplements can be medically useful when there is a documented deficiency, increased physiological requirement or another appropriate indication. However, high doses can cause toxicity or interfere with medications and other nutrients.
Diet Should Complement, Not Replace, Mental-Health Treatment
Someone experiencing persistent depression, severe anxiety, suicidal thoughts, psychosis, mania or significant functional impairment should seek appropriate professional assessment. Improving diet can occur alongside treatment, but it should not be used as a reason to delay necessary care.
Frequently Asked Questions About Nutrition and Mental Health
Can diet alone treat depression?
No. Depression is a complex medical condition with biological, psychological and social contributors. Dietary improvement may support recovery and may reduce depressive symptoms for some people, but it should not be considered a replacement for appropriate professional treatment.
What is the best diet for mental health?
There is no single diet that is universally best for everyone. However, Mediterranean-style and other minimally processed dietary patterns rich in vegetables, fruits, legumes, whole grains, nuts, seeds, fish and unsaturated fats have some of the strongest evidence for supporting overall health and are increasingly studied in relation to mental health.
Which foods are good for brain health?
Useful choices include oily fish, eggs, beans, lentils, leafy vegetables, whole grains, fruits, nuts, seeds and other minimally processed foods. The benefit comes primarily from the nutritional pattern rather than a single “brain-boosting” food.
Can gut health affect mood?
The gut and brain communicate through neural, hormonal, immune and metabolic pathways. Gut microorganisms can produce metabolites that influence host physiology. Research has identified associations between the gut microbiome and conditions such as depression and anxiety, but the field is still developing and it would be premature to claim that changing the microbiome can reliably treat psychiatric disorders.
Do omega-3 supplements help depression?
Some clinical research suggests that omega-3 supplementation, particularly formulations containing EPA, may provide modest benefits for certain people with depression when used alongside standard treatment. Results are not uniform, and supplements should not replace prescribed treatment. Discuss supplementation with a healthcare professional, particularly if you take medication or have a medical condition.
Can vitamin B12 deficiency affect mental health?
Yes. Significant vitamin B12 deficiency can cause neurological abnormalities, cognitive problems and other symptoms. People at higher risk include some older adults, people with absorption disorders and individuals who consume little or no animal-derived food without reliable B12 sources.
Does sugar cause depression?
The relationship is more complicated than a simple cause-and-effect statement. High intake of added sugars can contribute to poor dietary quality and metabolic problems, while observational studies have associated high-sugar dietary patterns with poorer mental-health outcomes. However, sugar alone cannot be identified as the sole cause of depression.
How quickly can diet affect mental health?
There is no universal timeline. Some effects of improved hydration, regular meals or correction of a nutritional deficiency may occur relatively quickly, while broader changes in metabolic and mental health can take considerably longer. Clinical outcomes also depend on sleep, activity, medication, therapy, stress and other factors.
Conclusion
The relationship between nutrition and mental health is biologically plausible and increasingly supported by clinical research, but it should be interpreted carefully. Food affects the body systems that support brain function, including energy metabolism, neurotransmitter pathways, immune regulation, cardiovascular health and the gut microbiome.
The most consistent practical message is not to search for a miracle food. Instead, build a dietary pattern around vegetables, fruits, legumes, whole grains, nuts, seeds, healthy fats and appropriate protein sources while reducing excessive intake of highly processed foods, added sugars and alcohol.
For many people, these changes can be made without expensive supplements or imported “superfoods.” Traditional and locally available foods—including beans, lentils, leafy greens, whole maize, millet, sorghum, groundnuts, eggs, avocado and locally available fish—can form the foundation of a nutrient-dense eating pattern.
At the same time, nutrition should be understood within the wider context of mental healthcare. Regular physical activity, sufficient sleep, social connection, stress management, appropriate medical care and psychological treatment can all play important roles.
References
The following organizations and peer-reviewed resources provide additional information about nutrition, brain health, mental health and nutritional deficiencies.
- World Health Organization. Mental disorders.
- World Health Organization. Alcohol.
- Harvard T.H. Chan School of Public Health. Diet and mental health.
- Jacka FN, et al. A randomised controlled trial of dietary improvement for adults with major depression: the SMILES trial. The Lancet Psychiatry.
- National Institutes of Health, Office of Dietary Supplements. Omega-3 Fatty Acids: Fact Sheet for Health Professionals.
- National Institutes of Health, Office of Dietary Supplements. Vitamin B12: Fact Sheet for Health Professionals.
- National Institutes of Health, Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals.
- National Institutes of Health, Office of Dietary Supplements. Vitamin D: Fact Sheet for Health Professionals.
- National Institutes of Health, Office of Dietary Supplements. Iron: Fact Sheet for Health Professionals.
- National Institutes of Health, Office of Dietary Supplements. Zinc: Fact Sheet for Health Professionals.
- National Institutes of Health. Gut microbiome influences brain health.
- National Center for Biotechnology Information. Serotonin and its physiological functions.
- Lane MM, et al. Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses. BMJ.
- Liao Y, et al. Efficacy of omega-3 polyunsaturated fatty acids in depressive disorders: systematic review and meta-analysis.
- Reviews examining the gut microbiota–brain relationship and implications for mental health.
- PubMed Central. Full-text archive of biomedical and life-sciences research.
- PubMed. Biomedical literature database maintained by the U.S. National Library of Medicine.
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