When we think about brain food, we tend to picture fish, blueberries or maybe a strong coffee.

But new research suggests one of the smartest things you can add to your day might already be sitting in your pantry: a handful of nuts.

A recent study published in the journal Nutrients followed more than 17,000 adults aged 45 and over for up to 18 years (1). The results showed that a small daily serve of nuts was linked to a 20% lower risk of developing dementia compared with eating none at all.

Interestingly, the benefit appears to build the more you eat.

People consuming at least 5g of nuts a day saw their risk drop by 24%. Researchers describe this as a “dose response” relationship, meaning the protective effect strengthens as nut intake increases.

Why nuts might protect the brain

So, how is a humble nut helping our brains?

Nuts contain a rich mix of nutrients and bioactive compounds, including omega-3 fats, vitamin E, magnesium and antioxidants, all of which help keep brain cells healthy and reduce inflammation.

Researchers also pointed to nuts’ known benefits for heart, blood vessels and metabolic health, as well as emerging evidence linking nuts to a healthier gut, both of which may help protect the brain.

This matters because dementia, including Alzheimer’s disease, is now Australia’s leading cause of death. But here’s the encouraging part: a recent scientific report found that nearly half of all dementia cases could potentially be prevented through improved lifestyle and health factors.

Diet is one of those factors we have real control over, and this research suggests nuts deserve a place at the table.

An easy habit to start

For Australians, this study is a reminder that protecting your brain doesn’t need to be complicated. Adding a daily handful of nuts (around 30g) to your day can make a genuine difference.

There are so many simple ways to build the habit:

• Sprinkle nuts over your morning porridge or overnight oats

• Keep a container at your desk for an afternoon snack

• Stir a spoonful of nut butter through your smoothie or spread it on toast if crunching on whole nuts isn’t your thing.

None of these changes require a dramatic diet overhaul. They’re small, everyday choices that, over time, may help protect one of our most important organs. So, next time you’re doing the grocery shop, add a bag of your favourite nuts to the trolley.