Your mental health influences how you think, feel and function each day — and nutrition can be one part of supporting your overall mental wellbeing.
Food doesn’t just provide energy. It supplies the nutrients your brain needs to function, provides fuel for your body, and influences your gut microbiome, blood glucose regulation and overall health.
Research increasingly suggests that overall dietary patterns are associated with mental health, with healthier patterns generally characterised by greater intakes of vegetables, fruit, wholegrains, legumes, nuts, seeds, fish and other nutritious foods. In Australia, healthier dietary patterns have also been associated with better mental health outcomes.
This doesn’t mean that one particular food will make you happier or that food can replace psychological or medical treatment.
Instead, think about nutrition as one of the everyday foundations that can support your brain and body.
The Gut–Brain Connection
One of the most fascinating areas of research is the relationship between your gut and your brain, known as the gut–brain axis.
Your gut microbiome interacts with your nervous system, immune system and metabolism, while compounds produced or influenced by gut microorganisms can participate in communication throughout the body.
You may have heard that around 90–95% of serotonin is produced in the gut.
There is truth behind this statistic, but it is often misunderstood.
Most serotonin in the body is produced in the gastrointestinal tract, mainly by specialised cells called enterochromaffin cells. However, this serotonin does not simply travel from your gut into your brain and make you feel happy. Gut serotonin has important roles in digestion, gut movement, immune signalling and other processes, while serotonin signalling in the brain is regulated separately.
The gut–brain connection is therefore much more complex than “eat well, make more serotonin, feel happier”.
Why Fibre Matters
Fibre is an important part of a healthy eating pattern and also provides fuel for many of the microorganisms living in your gut.
Good sources include:
- Wholegrains
- Fruit
- Vegetables
- Lentils
- Chickpeas
- Beans
- Nuts
- Seeds
Some fibres are fermented by gut microorganisms, producing compounds such as short-chain fatty acids that are involved in communication between the gut, immune system and other parts of the body.
This is one reason a varied, fibre-rich diet is an important part of supporting gut health.
And you don’t need a complicated “gut-health diet”.
A simple place to start is to increase the variety of plant foods you eat across the week.
Why Protein Matters
Protein provides amino acids that your body needs to maintain muscles, tissues, enzymes, hormones and neurotransmitter-related pathways.
Including protein regularly can also help make meals and snacks more satisfying.
Good options include:
- Eggs
- Yoghurt
- Milk
- Fish
- Lean meat
- Chicken
- Tofu
- Lentils
- Chickpeas
- Beans
- Nuts and seeds
Rather than thinking about protein purely as something for muscles, remember that it is also an important part of meeting your body’s overall nutritional needs.
What About Low-GI Foods?
The glycaemic index (GI) describes how quickly a carbohydrate-containing food raises blood glucose compared with a reference food.
Choosing lower-GI carbohydrate foods can help produce a more gradual blood glucose response, particularly when meals also contain protein, fat and fibre.
Examples include:
- Rolled oats
- Legumes
- Wholegrain breads
- Wholegrain pasta
- Barley
- Many whole fruits
However, low-GI doesn’t automatically mean “better for your mental health.”
Mood and mental wellbeing are influenced by many factors, and the evidence does not support treating low-GI foods as a direct treatment for depression or anxiety.
Instead, choose high-fibre carbohydrate foods regularly because they contribute to overall diet quality and can help create balanced, satisfying meals.
Foods That Can Support a Healthy Dietary Pattern
Rather than looking for individual “mood-boosting foods”, think about foods that contribute useful nutrients to your overall diet.
Yoghurt
Yoghurt can provide:
- Protein
- Calcium
- Other vitamins and minerals
Some yoghurts also contain live cultures.
Remember that not every yoghurt is a probiotic. A probiotic has a specific scientific definition, and probiotic effects depend on the particular microorganism and evidence for that strain.
Yoghurt can still be an excellent everyday food regardless of whether it is technically a probiotic product.
Try:
200 g yoghurt + berries + chia seeds + walnuts
Berries and Other Fruit
Fruit provides fibre, vitamins, minerals and a variety of plant compounds, including polyphenols.
Berries are one option, but there is no need to limit yourself to berries.
Try:
- Strawberries
- Blueberries
- Raspberries
- Kiwi fruit
- Oranges
- Apples
- Bananas
- Stone fruit
Different fruits provide different combinations of nutrients and plant compounds.
Sweet Potato
Sweet potato provides carbohydrate, fibre and beta-carotene, which the body can convert to vitamin A.
It can be an easy addition to:
- Grain bowls
- Salads
- Soups
- Curries
- Roast dinners
Pairing sweet potato with a protein source and vegetables can create a balanced meal.
Fish
Fish is an important part of a healthy dietary pattern and provides protein, iodine and other nutrients.
Oily fish such as salmon, sardines, trout and mackerel also provide the long-chain omega-3 fatty acids EPA and DHA.
Omega-3 fats are important components of brain cell membranes and have been extensively studied in relation to mental health. Some trials suggest potential benefits from omega-3 supplementation for depressive symptoms, although effects vary and supplements should not be viewed as a standalone treatment.
Eating fish regularly is therefore a practical way to include omega-3 fats as part of your diet.
Try aiming for around two serves of fish each week, including oily fish where possible.
Nuts and Seeds
Nuts and seeds provide a combination of:
- Unsaturated fats
- Protein
- Fibre
- Vitamin E
- Magnesium
- Other minerals and plant compounds
Walnuts provide the plant omega-3 fatty acid alpha-linolenic acid (ALA).
Try adding nuts or seeds to:
- Breakfast cereals
- Yoghurt
- Salads
- Smoothies
- Snacks
Wholegrains
Wholegrain foods such as oats, wholegrain bread, brown rice, quinoa, barley and wholegrain pasta provide:
- Fibre
- B vitamins
- Minerals
- Plant compounds
They are also a practical way to include higher-fibre carbohydrate foods in your meals.
Wholegrains aren’t just about “slow energy”.
Their overall nutritional package — including fibre and micronutrients — is what makes them valuable in a healthy dietary pattern.
What About Probiotics and Mental Health?
The gut–brain axis has led to considerable interest in whether probiotics can influence mental wellbeing.
Research involving probiotic supplements has found potential improvements in some measures of depression and anxiety. A 2025 systematic review of randomised controlled trials in clinically diagnosed populations found reductions in depressive and anxiety symptoms with probiotic interventions, although the studies varied substantially in their formulations and duration.
A 2026 meta-analysis focusing on major depressive disorder also found a benefit from probiotic supplementation, while highlighting the need for further research.
This is an interesting area of research, but remember that probiotics are strain-specific.
You cannot assume that every probiotic yoghurt, fermented food or supplement will have the same mental-health effect.
And fermented foods such as kimchi, sauerkraut and miso are not automatically probiotic foods.
Food Patterns Matter More Than “Superfoods”
One of the clearest themes emerging from nutrition and mental-health research is that overall dietary pattern matters.
A Mediterranean-style dietary pattern has been associated with better mental-health outcomes, and a 2025 systematic review of randomised controlled trials found that Mediterranean diet interventions reduced depressive symptoms in adults, although the certainty of evidence was low and more high-quality trials are needed.
This type of eating pattern generally includes:
- Plenty of vegetables
- Fruit
- Wholegrains
- Legumes
- Nuts and seeds
- Fish and seafood
- Extra virgin olive oil
- Moderate amounts of dairy and other protein foods
It also makes room for flexibility and enjoyment.
This is much more useful than trying to identify one food that is supposed to “boost serotonin” or instantly improve your mood.
What About Highly Processed Foods?
Highly processed foods can absolutely form part of your diet, but an eating pattern dominated by foods high in added sugars, saturated fat and sodium can make it harder to meet your nutritional needs.
The Australian Dietary Guidelines encourage a wide variety of nutritious foods, particularly vegetables and legumes, fruit, wholegrain cereals, dairy or alternatives, fish, seafood, poultry, eggs, nuts and seeds.
This doesn’t mean you need to eliminate packaged foods or make everything from scratch.
Convenient foods can be incredibly useful.
Examples include:
- Frozen vegetables
- Tinned fish
- Canned legumes
- Wholegrain bread
- Plain yoghurt
- Hummus
- Microwave brown rice
The goal is to build an overall nutritious eating pattern — not to achieve a perfect “clean” diet.
Putting It Into Practice: Simple Meal and Snack Ideas
You don’t need a complicated meal plan.
Breakfast
200 g yoghurt + berries + chia seeds + walnuts
Provides protein, fibre, calcium and a variety of plant compounds.
Lunch
Wholegrain crackers or bread + tuna + avocado + spinach
Provides protein, wholegrains, healthy fats and vegetables.
Dinner
Brown rice + vegetable-rich sauce + salmon
Provides wholegrains, vegetables, protein and omega-3 fats.
Another easy dinner
Roasted sweet potato + spinach + chickpeas + walnuts + extra virgin olive oil
Provides fibre, plant protein, healthy fats and a variety of vitamins, minerals and plant compounds.
Snack
Fruit + a handful of nuts
An easy combination of carbohydrate, fibre, healthy fats and protein.
A Realistic Approach Matters
You don’t need to completely change your diet to support your mental wellbeing.
Try making one small change at a time:
Add a piece of fruit to breakfast.
Include vegetables at lunch and dinner.
Choose wholegrain bread or cereals more often.
Add legumes to one meal each week.
Keep nuts or seeds available for snacks.
Include fish regularly.
Small changes can gradually improve the nutritional quality and variety of your diet without making eating feel overwhelming.
And remember, there is no need to eat perfectly.
Nutrition Is One Part of Mental Health
Food matters, but it is only one part of the picture.
Mental wellbeing is also influenced by sleep, physical activity, relationships, stress, life circumstances, genetics, medical conditions and access to appropriate mental-health care.
Nutrition should therefore complement, rather than replace, psychological or medical treatment when it is needed.
If you’re experiencing persistent low mood, anxiety or other mental-health concerns, speaking with your GP or a qualified mental-health professional is an important step.
Take Home Message
Looking after your mental health includes looking after your nutrition.
Rather than searching for one “mood food”, focus on the bigger picture:
Eat a variety of fruit and vegetables. Include fibre-rich wholegrains and legumes. Eat adequate protein. Include healthy unsaturated fats. Enjoy fish regularly. Add nuts and seeds. And choose foods that are both nutritious and enjoyable.
Your gut and brain are closely connected, and researchers are continuing to explore how the gut microbiome may contribute to mental wellbeing.
But you don’t need a perfect microbiome, a special supplement or a restrictive diet to support your health.
A varied, balanced and sustainable eating pattern is a great place to start.
How Feed Your Future Dietetics Can Help
Nutrition advice can become confusing when social media turns individual foods, supplements and gut-health products into solutions for mental health.
At Feed Your Future Dietetics, I help you separate evidence-based nutrition from the latest trend and develop practical strategies that fit your lifestyle, preferences and goals.
Whether you’re looking to improve your overall nutrition, support gut health, manage a health condition or build a more sustainable relationship with food, individualised dietetic support can help.
With over 10 years of experience supporting Australians with their nutrition and health goals, Feed Your Future Dietetics provides personalised dietetic support Australia-wide via Telehealth using Zoom or Microsoft Teams.
To learn more or book an appointment:
ashleigh@feedyourfuturedietetics.com
References
- Australian Government. Australian Dietary Guidelines. Eat For Health.
- Kabthymer RH, Karimi L, Livesay K, et al. Effect of Mediterranean diet on mental health outcomes: a systematic review. Nutrition Research Reviews. 2025;39.
- Bizzozero-Peroni B, Martínez-Vizcaíno V, Fernández-Rodríguez R, et al. The impact of the Mediterranean diet on alleviating depressive symptoms in adults: a systematic review and meta-analysis of randomized controlled trials. Nutrition Reviews. 2025;83(1):29–39.
- Asad A, Kirk M, Zhu S, Dong X, Gao M. Effects of prebiotics and probiotics on symptoms of depression and anxiety in clinically diagnosed samples: systematic review and meta-analysis of randomized controlled trials. Nutrition Reviews. 2025;83(7)–e1520.
- Tam SY. Probiotics for major depressive disorder: a systematic review and meta-analysis. East Asian Archives of Psychiatry. 2026;36(2):102–110.
- Banskota S, Ghia JE, Khan WI. Serotonin in the gut: Blessing or a curse. Biochimie. 2019;161:56–64.
- Yano JM, Yu K, Donaldson GP, et al. Indigenous bacteria from the gut microbiota regulate host serotonin biosynthesis. Cell. 2015;161(2):264–276.
- Cryan JF, O’Riordan KJ, Cowan CSM, et al. The microbiota-gut-brain axis. Physiological Reviews. 2019;99(4):1877–2013.
- National Health and Medical Research Council. Nutrient Reference Values for Australia and New Zealand.
- O’Neil A, Itsiopoulos C, Skouteris H, et al. Preventing and managing depression using lifestyle interventions: a systematic review and meta-analysis. American Journal of Medicine.
