Nutritional Psychiatry: The Science Behind Food, Mood and Mental Health.

Hand holding brain.

Key Takeaways:

Nutritional psychiatry explores the relationship between nutrition and mental health, recognising that the brain relies on a wide range of nutrients to function optimally.

Growing scientific evidence supports the role of nutrition in mental health. While research continues to evolve, studies increasingly suggest that improving dietary quality may help support mental wellbeing as part of a holistic approach.

The brain is one of the body's most energy-demanding organs, requiring a constant supply of nutrients to support mood, memory, concentration and emotional wellbeing.

A nutrient-rich diet supports brain function by providing the building blocks for neurotransmitters, healthy brain cells and energy production.

Supporting the body's underlying biology may help support brain function. Factors such as blood sugar regulation, inflammation, nutrient status, gut health and mitochondrial health can all influence how we think, feel and function.

Table of Contents

Beyond the Mind: The Emerging Connection Between Nutrition and Mental Health

For many years, conversations around mental health have focused primarily on thoughts, emotions and life experiences. However, our understanding of mental wellbeing has evolved to recognise that it is shaped by a complex interaction between psychological, biological and environmental factors. One area receiving growing attention within research is the role of nutrition and its influence on brain health, emotional wellbeing and cognitive function.

What is nutritional psychiatry?

Over the past decade, nutritional psychiatry has emerged as a growing field of research and clinical practice exploring the relationship between nutrition, brain function and mental health. Drawing on evidence from nutrition science, neuroscience and psychiatry, it examines how dietary patterns, nutrient status and related biological processes may influence psychological wellbeing, cognitive function and brain health.

Rather than viewing mental and physical health as separate, nutritional psychiatry recognises that they are deeply interconnected. Alongside factors such as genetics, life experiences, relationships, sleep, stress and environment, nutrition represents one modifiable factor that may help support the biological processes involved in mental wellbeing and emotional resilience.

The brain is one of the most metabolically active organs in the body and requires a continuous supply of energy and nutrients to function effectively. Food provides far more than calories; nutrients act as essential building blocks and cofactors involved in many processes that support brain health.

Research suggests that nutrition interacts with several key biological systems involved in mental health, including:

• Neurotransmitter synthesis: providing nutrients required for the production and regulation of brain chemicals such as serotonin, dopamine and GABA.

• Energy metabolism: supporting the production of cellular energy needed for optimal brain function.

• Inflammatory pathways and oxidative stress: influencing processes that can affect brain health when disrupted.

• Blood sugar regulation: helping to support stable energy levels, concentration and mood regulation.

• The gut-brain axis: the complex communication network linking the digestive system, immune system and brain.

  
  

Through these interconnected pathways, nutrition may contribute to supporting mood, motivation, cognitive function, stress resilience and overall emotional wellbeing. Nutritional psychiatry aims to better understand these complex relationships and identify personalised strategies that support the biological foundations of brain health and mental wellbeing.

Why does nutrition matter for mental health?

Your brain is one of the most energy-demanding organs in your body. Despite accounting for only around 2% of your body weight, it uses approximately 20% of your daily energy. To perform at its best, it relies on a constant supply of nutrients, including vitamins, minerals, amino acids, healthy fats and a reliable source of fuel, such as glucose or ketones. When these nutritional needs aren't adequately met, the brain's ability to regulate mood, memory, concentration, sleep and resilience to stress may be compromised.

Selection of healthy foods

Nutrients Provide the Building Blocks for Brain Function

Every thought, emotion and behaviour relies on billions of nerve cells communicating with one another. This communication is made possible by neurotransmitters - chemical messengers such as serotonin, dopamine, GABA and noradrenaline - which play important roles in regulating mood, motivation, concentration, sleep, stress responses and emotional wellbeing.

The production and function of these neurotransmitters depend on a wide range of nutrients. Amino acids from dietary protein provide the raw materials from which many neurotransmitters are synthesised, while nutrients such as B vitamins, iron, zinc, magnesium and omega-3 fatty acids support the enzymatic processes involved in their production, signalling and overall brain function. Ensuring the brain has access to the nutrients it needs provides an important foundation for optimal cognitive and emotional health.

The Gut-Brain Axis: Why Gut Health Matters

The connection between gut health and mental health has become one of the most exciting and rapidly evolving areas of nutritional psychiatry research. Far from working in isolation, the gut and brain are in continuous communication through a complex network known as the gut-brain axis.

This bidirectional communication occurs via several pathways, including the nervous system (particularly the vagus nerve), the immune system, hormones and the trillions of microorganisms that make up the gut microbiome. Together, these systems help coordinate everything from digestion and immune function to stress responses and brain signalling.

Emerging research suggests that the gut microbiome may influence processes involved in mental wellbeing, including inflammation, neurotransmitter activity, stress resilience and cognitive function. While scientists are still uncovering exactly how these interactions work, it is becoming increasingly well established that a healthy gut supports a healthy brain.

 

Inflammation doesn't just affect the body

Inflammation is a vital part of the body's natural defence system, helping us fight infection, repair damaged tissue and recover from injury. However, when inflammation becomes chronic and persists at a low level over time, it may begin to influence more than just physical health - including the brain.

An increasing body of research has identified associations between chronic low-grade inflammation and several mental health conditions, particularly depression. Although the relationship is complex, scientists believe that inflammatory signalling may affect processes involved in mood regulation and neurotransmitter function.

Diet is one of several lifestyle factors that can influence inflammatory pathways within the body. While no single food or dietary pattern can eliminate inflammation entirely, dietary patterns such as the Mediterranean diet have been associated with lower levels of inflammatory markers. Within nutritional psychiatry, inflammation is considered one of several interconnected biological pathways through which nutrition may influence brain function and emotional wellbeing.

Stable blood sugar supports a stable brain

The brain relies on a continuous supply of energy to function optimally, making stable blood sugar an important part of maintaining cognitive performance and emotional wellbeing. Many people will recognise the dip in energy, concentration or mood that can occur after skipping a meal or consuming foods (such as carbohydrates and foods high in sugar) that cause a rapid spike, and subsequent drop, in blood glucose.

Fluctuations in blood sugar can influence energy levels, focus, irritability and stress resilience in some individuals. Eating balanced meals that include protein, fibre and healthy fats can help promote more stable blood sugar levels, providing the brain with a steadier supply of energy throughout the day.

Supporting healthy blood sugar regulation is therefore an important consideration within nutritional psychiatry and forms one of the foundations of nutrition for brain health and emotional wellbeing.

Mitochondria: Powering the Brain

Every cell in the body relies on tiny structures called mitochondria to produce energy. Often referred to as the cell's "powerhouses", mitochondria convert the nutrients we eat into the energy needed for cells to grow, repair and function. Given the brain's exceptionally high energy demands, healthy mitochondrial function is essential for supporting cognition, mood and overall brain health.

Emerging research suggests that changes in energy metabolism and mitochondrial function may play a role in some mental health conditions, including depression and bipolar disorder. This has contributed to the emergence of metabolic psychiatry, a developing field of research that explores how optimising brain energy metabolism may help support mental health. As part of this, researchers are investigating nutritional strategies that influence brain metabolism, such as the ketogenic diet, and early studies have shown very promising results when implemented under appropriate clinical supervision.

More broadly, nutrients such as B vitamins, magnesium, iron, coenzyme Q10 and omega-3 fatty acids all contribute to cellular energy production, reinforcing the importance of a nutrient-rich dietary pattern in supporting optimal brain function.

What Does Nutritional Psychiatry Look Like in Practice?

One of the fundamental principles of nutritional psychiatry is that there is no one-size-fits-all approach. Mental health symptoms can arise from a complex interaction of biological, psychological and lifestyle factors, and the contributing factors can look very different from one person to the next.

For example, two people experiencing anxiety may present with similar symptoms but have very different biological factors contributing to their experience. One person may have challenges with blood sugar regulation, where significant fluctuations in glucose may contribute to changes in energy levels, concentration, mood stability and the body’s stress response. Another may have digestive dysfunction affecting nutrient absorption, microbial balance and communication along the gut-brain axis. Someone else may have increased inflammatory signalling, which can influence processes involved in neurotransmitter metabolism, brain function and emotional wellbeing.

This is why we take an individualised, root-cause approach at Re:Health Clinic. Rather than applying generic recommendations, we focus is on understanding the unique combination of factors that may be influencing someone's mental wellbeing.

Building a Complete Picture of Your Health

At Re:Health, our approach begins with a comprehensive assessment designed to build a thorough understanding of your health, lifestyle and medical history. By considering the wider picture, we can begin to identify the biological, nutritional and lifestyle factors that may be influencing your mental wellbeing and use this information to develop a personalised, evidence-informed plan.

This includes exploring:

• Current symptoms and health concerns

• Medical history

• medications

• Diet and eating patterns

• Nutrient intake and dietary diversity

• Digestive health and gut function

• Energy levels and fatigue

• Sleep quality

• Stress levels and lifestyle factors

• Hormonal health

  
  

Where appropriate, functional testing may also be considered to provide further insight into areas such as nutritional status, digestive function, metabolic health or other physiological processes that we suspect may be driving your symptoms. This information helps us understand potential areas of imbalance and identify practical, personalised strategies to support your brain health and overall wellbeing.

Who might benefit from nutritional psychiatry?

Nutritional psychiatry may be helpful for individuals who are looking to better understand the relationship between their nutrition, physical health and mental wellbeing. It may be particularly relevant for people experiencing concerns such as:

• Anxiety

• Depression and low mood

• OCD

• ADHD

• Autism

• Bipolar disorder

• Schizophrenia

• Burnout

• Chronic stress

• Brain fog and cognitive difficulties

• Mental fatigue

It is important to recognise that nutritional therapy is highly individual. The factors contributing to mental health symptoms will vary from person to person, meaning there is no single diet or nutritional approach that works for everyone. At Re:Health Clinic, our aim is not to offer quick fixes, but to help optimise the biological foundations that support brain health, mental health and resilience over the long term.

 

The bottom line

The relationship between nutrition and mental health is a complex and evolving area of research. While mental health is influenced by many factors, including genetics, life experiences, stress, sleep, relationships and physical health, there is growing evidence that nutrition plays an important role in supporting brain function and emotional wellbeing.

Nutritional psychiatry brings together emerging research from areas such as diet and mental health, the gut-brain axis, inflammation, metabolic health and nutrient status, and research continues to explore how specific nutritional factors may influence mood, cognition and resilience. Nutritional psychiatry recognises that supporting the body's underlying biology can form one important part of a wider, personalised approach to mental wellbeing.

At Re:Health, we draw on this growing evidence base to inform our approach to nutritional therapy, combining current research in nutritional psychiatry with a personalised understanding of each individual's health history, symptoms and circumstances. We recognise that every person is unique, and we use this evidence-informed framework to explore the nutritional, biological and lifestyle factors that may be influencing mental wellbeing. Through a root-cause approach, we look beyond symptoms alone to understand the whole person and develop practical, sustainable strategies to support both brain and body health.

If you're looking for a deeper understanding of how nutrition and lifestyle factors may be influencing your mental and physical wellbeing we would be happy to support you. Get in touch to discover how a personalised nutritional psychiatry approach could help you optimise your health.

Frequently Asked Questions

Is nutritional psychiatry evidence-based?

Yes. Nutritional psychiatry is a rapidly growing area of scientific research. While it is still an emerging field, there is increasing evidence that diet, gut health, inflammation, blood sugar regulation and certain nutrient deficiencies can influence brain function and mental wellbeing.

What conditions can nutritional psychiatry support?

Nutritional psychiatry may be beneficial for people experiencing anxiety, depression, OCD, ADHD, bipolar disorder, schizophrenia, burnout, chronic stress, low mood, brain fog and other cognitive concerns. Every individual is different, so recommendations are always tailored to the person's unique circumstances and health history.

What happens during a nutritional therapy consultation?

Your first consultation involves a detailed assessment of your health, including your medical history, diet, digestive health, sleep, lifestyle, medications, stress levels and current symptoms. This helps us understand the factors that may be contributing to your symptoms and allows us to develop a personalised nutrition and lifestyle plan.

Will I need supplements?

Food always forms the foundation of our recommendations. However, where appropriate, targeted supplements may be recommended based on your symptoms, dietary intake, medical history and, in some cases, functional laboratory testing. Supplements are used to complement, not replace, a nutrient-rich diet.

Can nutritional psychiatry work alongside medication?

Yes. Nutritional therapy is designed to complement conventional healthcare. However some supplements may interact with medications. It is important to work with a qualified practitioner who can assess safety, dosage and suitability based on your individual circumstances.

Is nutritional psychiatry suitable for everyone?

Most people can benefit from improving the quality of their diet. However, recommendations should always be individualised. Nutritional therapy should be provided by a qualified practitioner who takes into account your medical history, medications and individual health needs.

 

References

Adan, R. A. H., van der Beek, E. M., Buitelaar, J. K., Cryan, J. F., Hebebrand, J., Higgs, S., et al. (2019). Nutritional psychiatry: Towards improving mental health by what you eat. European Neuropsychopharmacology, 29(12), 1321–1332.

Firth, J., Gangwisch, J. E., Borsini, A., Wootton, R. E., & Mayer, E. A. (2020). Food and mood: How do diet and nutrition affect mental wellbeing? BMJ, 369, m2382.

Firth, J., Marx, W., Dash, S., et al. (2019). The effects of dietary improvement on symptoms of depression and anxiety: A meta-analysis of randomised controlled trials. Psychosomatic Medicine, 81(3), 265–280.

Jacka, F. N., O'Neil, A., Opie, R., et al. (2017). A randomised controlled trial of dietary improvement for adults with major depression (The SMILES Trial). BMC Medicine, 15, 23.

Lassale, C., Batty, G. D., Baghdadli, A., et al. (2019). Healthy dietary indices and risk of depressive outcomes: A systematic review and meta-analysis of observational studies. Molecular Psychiatry, 24, 965–986.

Marx, W., Moseley, G., Berk, M., & Jacka, F. (2017). Nutritional psychiatry: The present state of the evidence. Proceedings of the Nutrition Society, 76(4), 427–436.

O'Neil, A., Quirk, S. E., Housden, S., et al. (2014). Relationship between diet and mental health in children and adolescents: A systematic review. American Journal of Public Health, 104(10), e31–e42.

Sarris, J., Logan, A. C., Akbaraly, T. N., et al. (2015). International Society for Nutritional Psychiatry Research consensus position statement: Nutritional medicine in modern psychiatry. World Psychiatry, 14(3), 370–371.

Sarris, J., Ravindran, A., Yatham, L. N., et al. (2022). Clinician guidelines for the treatment of psychiatric disorders with nutraceuticals and phytoceuticals. World Journal of Biological Psychiatry, 23(6), 424–455.

Young, L. M., Pipingas, A., White, D. J., et al. (2022). A systematic review and meta-analysis of the effect of dietary interventions on depression and anxiety in adults. Nutrition Reviews, 80(5), 1187–1206.

About the Author

Anna Roscher, Registered Nutritional Therapist and Nutritional Psychiatry Practitioner.

Anna is a Registered Nutritional Therapist and Nutritional Psychiatry Practitioner with a specialist interest in mental health. She supports individuals experiencing anxiety, depression, OCD, ADHD, burnout, bipolar disorder, schizophrenia, through a compassionate, trauma-informed, and evidence-based approach.

Anna combines advanced training in Nutritional Pscyhiatry with a First-Class degree in Applied Psychology with Sociology, a Level 3 Certificate in Counselling, and extensive experience as a Mental Health Lead in the charity sector. Her background includes providing one-to-one emotional support and facilitating psychoeducational groups for both young people and adults living with mental health conditions.

Anna is passionate about helping clients uncover the root causes of their symptoms through comprehensive assessment and, where appropriate, targeted functional testing. By combining personalised nutrition, lifestyle medicine, and the latest research in nutritional psychiatry, she empowers clients to make meaningful, sustainable changes that support long-term mental and physical wellbeing.