How does the food we eat influence the way we think, feel, and respond to everyday challenges? This question is attracting growing attention from researchers investigating the relationship between nutrition and mental health. Nutritional psychiatry, an emerging area of scientific research, examines how dietary patterns, nutrients, and the relationship between the gut and the brain may influence emotional well-being and psychological functioning.

Professor Felice Jacka, an internationally recognised researcher associated with the development of nutritional psychiatry, has helped advance scientific understanding of the connections between food and mental health. She was named the 2026 L’Oréal-UNESCO For Women in Science International Award Laureate for Asia and the Pacific, recognising her contributions to this field.

Her work highlights the importance of examining nutrition as one component of a broader approach to mental health. On World Mental Health Day, the subject offers an opportunity to explore how evidence-based dietary habits may support brain health throughout life.

Understanding Nutritional Psychiatry

Nutritional psychiatry investigates the ways in which food and dietary patterns may influence mental health, mood, cognition, and the biological processes involved in brain function.

Traditional approaches to mental health have often focused on psychological therapies, medication, social circumstances, and behavioural interventions. These remain important components of care. Nutritional psychiatry expands the discussion by examining whether dietary quality also contributes to psychological well-being.

The human brain requires a continuous supply of energy and essential nutrients to function properly. Vitamins, minerals, fatty acids, amino acids, and other dietary components participate in biological processes involved in communication between brain cells, energy metabolism, and the regulation of bodily functions.

However, eating a particular food does not automatically improve mental health. Researchers study overall dietary patterns, nutritional deficiencies, metabolic processes, and other factors to understand how food may influence psychological outcomes.

Nutritional psychiatry therefore seeks to identify relationships supported by scientific evidence rather than promote simplistic claims about individual foods or miracle diets.

Professor Felice Jacka’s Contribution to Mental Health Research

Professor Felice Jacka has been a prominent contributor to research exploring the relationship between diet and mental health.

Her work has helped establish nutritional psychiatry as an important area of scientific investigation. Rather than treating food solely as a source of energy or a factor in physical health, this research examines whether dietary quality is associated with mental health outcomes.

One important question is whether healthier dietary patterns can form part of strategies to prevent or manage certain mental health difficulties.

Research in this area has examined the relationships between dietary quality, depression, inflammation, metabolic health, and the gut microbiome.

Some observational studies have found associations between healthier dietary patterns and better mental health outcomes. Such findings are valuable, but they do not always establish that diet directly causes the observed differences.

Researchers must also consider other influences, including physical activity, sleep, income, social relationships, access to healthcare, and existing medical conditions.

Controlled clinical trials can provide additional evidence about whether dietary interventions improve mental health outcomes in particular populations.

The broader objective is to build a reliable scientific foundation for understanding how nutrition can complement established approaches to mental healthcare.

How Food Supports Brain Function

The brain is an energy-demanding organ that depends on a steady supply of nutrients. A balanced diet supports several biological processes essential to its normal functioning.

1. Essential Nutrients and Brain Development

Nutrients such as iron, folate, vitamin B12, iodine, and other vitamins and minerals contribute to normal neurological function and development.

For example, iron is involved in oxygen transport and several processes associated with brain function. Vitamin B12 supports normal nerve function, while folate participates in processes required for cell growth and development.

Nutritional deficiencies can affect health and may contribute to symptoms such as fatigue, cognitive difficulties, or other neurological problems, depending on the deficiency.

However, taking additional supplements does not necessarily improve mood or cognition in people who already obtain adequate nutrients from their diets.

The appropriate approach is to maintain a balanced diet and seek medical advice when a deficiency or other nutritional concern is suspected.

2. Healthy Fats and the Brain

Certain fats play important roles in brain structure and function.

Omega-3 fatty acids are found in foods such as oily fish, while some plant foods, including flaxseeds, chia seeds, and walnuts, provide the omega-3 fatty acid alpha-linolenic acid.

These nutrients contribute to normal physiological processes, including those involving cell membranes.

Scientists continue to investigate whether specific fatty acids or dietary patterns can improve particular mental health outcomes. Findings vary according to the intervention, population, and condition being studied.

Omega-3 supplements should not be considered a universal treatment for depression or other mental health conditions.

3. Protein and Neurotransmitter Production

Protein provides amino acids that the body uses to build and maintain tissues. Some amino acids also serve as precursors for neurotransmitters, which are chemical messengers involved in communication within the nervous system.

Protein-containing foods include pulses, beans, lentils, eggs, dairy products, fish, poultry, nuts, and seeds.

Consuming adequate protein as part of a balanced diet supports general health. However, the relationship between individual amino acids and mood is complex, and eating a particular protein-rich food does not guarantee a specific emotional response.

4. Vitamins and Minerals

Several micronutrients contribute to normal nervous-system function and energy metabolism.

A varied diet containing vegetables, fruits, whole grains, pulses, nuts, seeds, and appropriate protein sources can help provide many of these nutrients.

People with restricted diets, certain medical conditions, or increased nutritional requirements may need individual assessment to ensure adequate intake.

The key principle is dietary adequacy rather than excessive supplementation.

The Gut-Brain Connection: Why Digestive Health Matters

One of the most active areas of nutritional psychiatry research concerns communication between the digestive system and the brain.

The gut and brain communicate through several pathways, including the nervous system, immune signalling, hormones, and substances produced by microorganisms living in the digestive tract.

This network is commonly described as the gut-brain axis.

The gut microbiome consists of bacteria and other microorganisms that live in the digestive system. These organisms help break down certain dietary components and produce substances that can influence processes within the body.

Dietary fibre, found in foods such as whole grains, vegetables, fruits, and pulses, can support beneficial microbial activity.

Researchers are investigating whether changes in the gut microbiome are associated with depression, anxiety, and other mental health conditions.

Although early findings are promising in some areas, the science remains complex. Researchers have not established a single microbiome profile that explains mental health across all individuals.

Nor is there sufficient evidence to claim that a particular probiotic, fermented food, or supplement can independently prevent or cure psychiatric conditions.

The gut-brain connection is an important research area, but further studies are needed to determine which dietary interventions produce reliable clinical benefits.

Can a Healthy Diet Help Reduce the Risk of Depression?

Research has identified associations between dietary quality and depression, prompting scientists to investigate whether improving nutrition can support mental health.

Observational studies have frequently examined dietary patterns rich in vegetables, fruits, whole grains, legumes, nuts, and other minimally processed foods.

Some research suggests that people who follow healthier dietary patterns may experience better mental health outcomes on average.

However, the relationship can work in both directions.

People experiencing depression may have difficulty shopping, cooking, maintaining routines, or eating regularly. Financial difficulties, social isolation, and disrupted sleep can also affect dietary choices.

Consequently, poor dietary quality may sometimes be a contributing factor, a consequence of mental health difficulties, or part of a more complicated relationship involving several influences.

Clinical research has begun to test whether structured dietary improvement can help people experiencing depression. Results suggest potential benefits in some circumstances, but effects are not uniform, and diet should not replace established treatment.

Mental health professionals may consider nutritional support as part of an individualised care plan when appropriate.

Practical Dietary Habits That May Support Mental Well-Being

Maintaining a balanced diet does not require expensive products or complicated meal plans. Many useful dietary habits can be incorporated into everyday life.

Eat a Variety of Vegetables and Fruits

Vegetables and fruits provide fibre, vitamins, minerals, and other biologically active compounds.

Eating a variety of produce helps increase the range of nutrients available to the body.

Fresh, frozen, and appropriately prepared seasonal produce can all contribute to a balanced diet.

Include Whole Grains and Pulses

Whole grains such as oats, brown rice, and whole-wheat products provide fibre and other nutrients.

Pulses, including lentils, chickpeas, beans, and peas, provide protein, fibre, and several micronutrients.

These foods can be included in a variety of meals and are often affordable options for households.

Choose Appropriate Protein Sources

Protein can come from plant-based sources, such as beans, lentils, nuts, and seeds, as well as eggs, dairy products, fish, and other foods according to individual dietary preferences.

A varied selection of protein sources can help support general nutritional needs.

Include Healthy Fat Sources

Nuts, seeds, and suitable vegetable oils can contribute unsaturated fats to the diet. Fish may provide long-chain omega-3 fatty acids.

The appropriate combination depends on individual needs, food availability, cultural preferences, and medical considerations.

Limit Excessive Consumption of Highly Processed Foods

Highly processed foods vary considerably in their nutritional composition. Some are convenient and can fit into a balanced diet, while others contain high levels of added sugars, sodium, or less desirable fats.

A practical approach is to make nutrient-rich foods the foundation of everyday meals while considering the overall dietary pattern rather than labelling every processed food as harmful.

Maintain Regular Eating Habits

Regular meals may help people meet their nutritional needs and maintain a consistent daily routine.

Skipping meals because of a busy schedule, low appetite, or emotional distress can make it harder to maintain adequate nutrition.

People experiencing persistent changes in appetite or weight should consider seeking appropriate medical advice.

Nutrition Is Only One Part of Mental Health

Although diet may contribute to mental well-being, mental health is influenced by many interacting factors.

Genetics, childhood experiences, physical health, stress, sleep, relationships, financial security, discrimination, and access to healthcare can all affect psychological outcomes.

A person experiencing depression or anxiety should not be led to believe that their condition results simply from poor food choices.

Mental health conditions are complex and are not personal failures.

Healthy dietary habits can complement other supportive practices, including regular physical activity, sufficient sleep, social connection, and professional mental healthcare.

For people experiencing persistent emotional distress, severe symptoms, or difficulties with everyday functioning, consultation with a qualified healthcare professional is important.

Prescribed medication and psychological treatment should not be stopped or replaced with dietary changes without appropriate clinical guidance.

A comprehensive approach recognises that different people need different forms of support.

Making Nutritional Knowledge Accessible to Everyone

The benefits of nutrition research can be limited if practical guidance is available only to people who can afford expensive foods or specialised services.

Access to nutritious food is influenced by household income, food prices, local availability, transportation, cooking facilities, and time constraints.

Public health strategies can help address these barriers through nutrition education, food security initiatives, accessible healthcare, and support for healthy school and workplace meals.

Healthcare professionals can also help people make realistic dietary changes that reflect their cultural backgrounds, budgets, medical needs, and personal preferences.

For some households, improving nutrition may begin with simple changes, such as adding pulses to meals, increasing the variety of vegetables, or choosing whole grains more frequently.

Public messaging should avoid creating unrealistic expectations or encouraging restrictive eating practices.

The aim is to make balanced nutrition accessible, practical, and sustainable.

Recognising Women in Science on World Mental Health Day

The recognition of Professor Felice Jacka through the 2026 L’Oréal-UNESCO For Women in Science International Awards for Asia and the Pacific highlights the contribution of women researchers to scientific discovery.

Scientific progress depends on researchers asking new questions, testing established assumptions, and examining complex problems from different perspectives.

Research into nutritional psychiatry brings together areas including neuroscience, nutrition, psychology, immunology, and microbiology.

This interdisciplinary work demonstrates how collaboration across scientific fields can expand understanding of human health.

Recognising researchers also helps draw public attention to emerging scientific questions and encourages future generations to consider careers in research.

On World Mental Health Day, discussions about nutrition and brain health provide an opportunity to connect scientific knowledge with practical public health priorities.

The important task is to translate research findings into reliable guidance while remaining transparent about uncertainties and limitations.

The Future of Nutritional Psychiatry

Research into the relationship between diet and mental health continues to develop.

Future studies may help clarify which dietary patterns are most beneficial for particular groups, how the gut microbiome influences psychological processes, and whether personalised nutrition approaches can improve treatment outcomes.

Scientists also need to understand how economic circumstances, cultural food practices, medical conditions, and individual differences affect the success of dietary interventions.

Larger and longer-term clinical trials will be important for determining the extent to which nutritional changes can support the prevention or treatment of specific mental health conditions.

As evidence develops, healthcare professionals may become better equipped to integrate appropriate nutritional guidance into comprehensive mental healthcare.

Nevertheless, scientific progress should be measured through reliable research rather than exaggerated promises about food as a cure for psychological difficulties.

Conclusion

Nutritional psychiatry is expanding scientific understanding of how food, brain function, and mental well-being may be connected.

The work of Professor Felice Jacka has helped bring attention to this relationship and encouraged further investigation into the potential role of dietary quality in mental healthcare.

Evidence suggests that a balanced diet supports general health and may contribute to mental well-being. Researchers are also examining how nutrients, inflammation, metabolism, and the gut-brain axis influence psychological functioning.

However, diet is only one part of a much broader picture. Mental health depends on biological, psychological, and social factors, and people experiencing mental health conditions may need professional treatment alongside practical lifestyle support.

The most useful message is not that food can solve every mental health problem, but that nutrition deserves a place in evidence-based conversations about lifelong well-being.

By combining sound nutritional guidance, continued scientific research, accessible healthy food, and compassionate mental healthcare, societies can take a more comprehensive approach to supporting both brain health and emotional well-being.