News Want to boost your brain health? Here’s some (plant-based) food for thought

New research has linked plant-based eating to a lower risk of dementia, better mood, and sharper cognition. Here’s what to eat now for a happier, healthier brain later…

We talk a lot about what eating more plants can do for your heart health, your weight, your sleep, muscle recovery — the list of evidence-backed physical benefits just keeps stacking up. But one area most of us are only just starting to pay attention to is how much diet affects our brain function.

As it turns out, quite a lot! Recent research makes a pretty compelling case for plant-based eating, with studies showing that shifting away from animal products is one of the most powerful ways to improve your cognition, lift your mood, and reduce your risk of dementia.

According to experts, a decline in brain health is not inevitable with age, and our daily food habits can make a big difference in our memory and overall brain function as we age.

Keen to eat better for a sharper, healthier brain? Read on for a breakdown of what the science says, and all the best brain foods to add to your plate.

First, a bit of biology: Your brain runs on what you eat

The human brain is a surprisingly hungry organ, consuming around 20% of your daily energy, despite making up only about 2% of your body weight.

To do its job well, it needs a constant, high-quality supply of nutrients — fats for structure, glucose for fuel, vitamins for cellular repair, antioxidants to fight damage, and a diverse array of gut-bacteria-producing compounds that communicate directly with your neurons.

What you eat shapes every single one of these systems, which is why fuelling your brain properly is so important.

What does science say about plant-based eating and the brain?

The science is in, and it strongly favours plants. A major 2025 meta-analysis published in Nutrition Reviews found that a healthy plant-based diet was associated with significantly lower odds of anxiety, depression, and psychological distress — as well as a meaningfully reduced risk of cognitive decline and dementia.

Research has also linked plant-based eating to better performance across a range of cognitive tasks, including long-term memory recall, processing speed, and executive function (the mental toolkit you use for planning, problem-solving, and decision-making).

One study even found that plant-based eating was associated with a reduction in stroke risk — and since vascular health and brain health are deeply intertwined, that’s no small thing. Better blood pressure, improved cholesterol, and healthier blood vessels all mean better circulation to the brain, which means better function all around.

Why does eating processed red meat increase dementia risk?

Saturated and trans fats (found in red meat, processed meat, dairy products, and fried foods) are strongly associated with an increased risk of cognitive decline. One explanation is that these fats contribute to arterial plaque build-up that compromises blood flow to critical areas of the brain.

Research into processed red meat specifically has produced some striking findings. A Harvard study published in the journal Neurology found that people eating higher amounts of processed red meat had a 14% higher risk of developing dementia, along with greater rates of cognitive decline and worse overall cognitive function.

The effect of eating plant-based foods was equally striking, but from the other direction — replacing just one serve of processed red meat daily with nuts and legumes was linked to a 19% lower risk of dementia.

Experts say the thread tying all these findings together is likely inflammation. Chronic, low-grade inflammation is now understood to be a significant driver of neurodegenerative diseases like Alzheimer’s and Parkinson’s, as well as mood disorders like depression.

And a diet rich in whole plant foods — with its high levels of fibre, antioxidants, and phytonutrients — is one of the most effective dietary tools we have for keeping inflammation in check.

Note: Experts say it’s important to remember that, while food is one of our most effective levers for long-term brain health, it works best alongside other healthy habits. Diet is powerful, but it’s not the whole picture! Regular physical activity, good quality sleep, and social connection all contribute to mental resilience, as does avoiding smoking and limiting alcohol.

Your gut and your brain are in constant conversation

Something that surprises most people is that a whopping 90-95% of your body’s serotonin (the neurotransmitter most associated with mood, wellbeing, and emotional stability) is actually produced in your gut, not your brain.

That said, gut serotonin and brain serotonin operate separately — the gut’s serotonin doesn’t actually cross into the brain, where brain serotonin plays its mood-regulating role. What this 90-95% figure really tells us is just how central the gut is to the body’s broader chemical signalling, and how much remains to be discovered about how the two systems communicate.

The gut-brain connection is one of the most exciting and actively researched areas in neuroscience right now. The idea is that your gut and brain are in continuous two-way communication via the vagus nerve, immune signalling, and a constant stream of neuroactive compounds.

What you eat shapes the composition of your gut microbiome, which in turn shapes the stability of that communication back and forth — meaning the state of your gut has a real and measurable influence on how you think and feel.

The key nutrient that drives this system is dietary fibre, which is exclusively found in plant foods and not at all in animal products. When you eat a diverse range of fruits, vegetables, legumes, and whole grains, the fibre feeds beneficial gut bacteria, which produce compounds called short-chain fatty acids (SCFAs).

One of these, butyrate, has been shown to help maintain the integrity of the blood-brain barrier and reduce neuroinflammation. People who eat more plant foods tend to have higher levels of butyrate, which may explain why vegetarian and vegan eating patterns are consistently linked to better mood and cognition.

What should we be eating every day for brain health?

Health and nutrition research points clearly to a few categories of foods that are remarkably protective for your brain. Here are some tips to get you started:

🥛 Swap dairy for plant-based alternatives. Choosing oat, soy, almond, or coconut alternatives when buying milk, yoghurt, and cheese is an easy way to significantly reduce your intake of saturated fat and cholesterol — both of which are worth keeping in check.

🌿 Replace processed and red meat with plant protein. Lentils, chickpeas, black beans, and soy-based foods are all versatile, satisfying, and far kinder to your brain in the long run. Try lentil bolognese instead of beef mince, marinated tofu or tempeh strips instead of bacon, or grab a plant-based beef alternative from the supermarket. Small, consistent swaps add up faster than you’d think!

🌈 Eat the rainbow, every single day. Diversity of plant foods drives diversity of gut bacteria, which in turn (via that gut-brain connection we mentioned earlier) drives brain health. Aim for 30 or more different plant foods per week. Herbs and spices count, too!

🫐Make berries a daily non-negotiable. Blueberries, strawberries, raspberries, blackberries — any and all. Their high antioxidant content makes them one of the most evidence-backed foods for a healthier brain. A handful on your morning oats or as an afternoon snack is a simple, low-effort way to make them part of your daily routine.

🧠Put walnuts on everything. They’re the only nut with meaningful ALA levels (a plant-based omega-3), and they look uncannily like a brain, which feels appropriate 😉 Chop them up for salads, blend them into pesto, scatter them over grain bowls, or eat them as-is for a quick and nourishing snack.

🥄Add ground flaxseed or chia seeds to one meal daily. A single tablespoon is enough to meet your daily omega-3 needs. It’s easy to add but equally easy to forget, so try to build flaxseed meal or chia seeds into a meal you already make every day (your bowl of muesli in the morning, for example).

🥬 Eat leafy greens daily. Spinach, kale, rocket, and silverbeet are all rich in brain-healthy nutrients like folate, antioxidants, iron, and magnesium. Pick whichever greens you like the most and find ways to work them into your usual meals. Wilt spinach through pasta, add kale to soup, or keep a bag of rocket in the fridge for an easy side salad.

🫘 Include legumes at most meals. Lentils, chickpeas, black beans, and edamame provide protein, iron, zinc, folate, fibre, and prebiotic fuel for your gut microbiome all at once. And not only are they extremely nutrient-dense, but they’re also super affordable.

💛 Supplement with B12. B vitamins, particularly B12, are essential for nerve function and are involved in the metabolism of homocysteine — elevated levels of which are associated with increased Alzheimer’s risk. It’s especially important to keep an eye on your B12 if you’re eating mostly or entirely plant-based.

Nourishing your brain begins with what’s on your plate

So there you have it — the same dietary pattern that research links to lower rates of heart disease, type 2 diabetes, and certain cancers also turns out to be the best way of nourishing your brain. (Who would have thought!)

You already know that what you eat shapes and affects how well your body functions, so it’s worth remembering that your brain is no different. Some forward thinking about your diet now could protect your mental well-being for many years to come.

Start by making a few small swaps this week, or grab a free veg starter kit if you’re ready to dive straight into plant-based eating. Your 86 billion neurons — and your future self — will thank you!

Want to understand the full picture of what plant-based eating can do for your health? We’ve rounded up even more exciting research findings here.