New research from Australia suggests that higher sodium intake may be linked to faster memory decline in men, offering another reminder of how everyday dietary choices can shape long-term wellbeing.
The study, led by Edith Cowan University (ECU) and published in Neurobiology of Ageing, tracked 1,208 adults over a period of six years.
It found that men who consumed more sodium experienced a faster decline in episodic memory – the type of memory that helps us recall personal experiences, such as where we parked the car or what we did yesterday.
Interestingly, the same pattern was not observed in women, suggesting that biological differences may play a role, although researchers say more work is needed to fully understand why.
Episodic memory is one of the first cognitive functions to be affected as people age, and changes in this area are often linked to conditions such as dementia. While the study does not prove that salt directly causes memory loss, it adds to a growing body of research pointing to diet as a key factor in brain health.
Sodium itself is essential for the body, helping to regulate fluid balance and nerve function. But excessive intake has long been associated with high blood pressure and cardiovascular disease – both of which are known to affect blood flow to the brain.
Researchers believe this may be one possible explanation for the findings: high sodium levels may contribute to inflammation in the brain, damage to blood vessels, and reduced circulation, all of which can gradually affect cognitive function over time.
There is also emerging evidence from earlier studies suggesting that high-salt diets could interfere with how brain cells communicate, potentially affecting memory and learning processes.
Still, the Australian experts emphasise that the research should be seen as part of a broader picture.
“Our findings provide early evidence of a link between higher sodium intake and cognitive function, but more research is needed to fully understand how and why this relationship exists,” said lead researcher Samantha Gardener.
What is clear, nevertheless, is that diet remains one of the most modifiable factors when it comes to long-term health.
Health guidelines in countries such as Australia recommend limiting sodium intake to around 2,000mg per day – roughly equivalent to one teaspoon of salt – although many people exceed this amount without realising it, particularly through processed and packaged foods.
For now, experts say the takeaway is not to eliminate salt entirely but to be mindful of overall intake. Small, consistent choices – from reducing processed foods to balancing meals – may play a role in supporting memory and cognitive function as we age.