High-salt diet linked to faster memory decline in men, new Australian study finds

A diet high in salt could be doing more than raising blood pressure  – it may also be speeding up memory decline in men, according to new Australian research.

The study from Edith Cowan University has found a link between higher sodium intake and reduced episodic memory, the type of memory used to recall everyday experiences like where you parked the car or important life events.

Researchers tracked 1,208 participants over six years, measuring both their sodium intake and changes in cognitive function. The results showed that men who consumed higher levels of sodium experienced a faster decline in episodic memory.

Interestingly, the same pattern was not seen in women.

Lead researcher Dr Samantha Gardener said the findings point to a potential new factor in understanding cognitive decline and dementia risk.

“The male participants also exhibited higher blood pressure, which is influenced by sodium intake,” she said. “But further investigation is definitely required into sex-specific approaches and how sodium intake could be incorporated as one modifiable lifestyle factor.”

More than just heart health

High sodium intake has long been linked to increased risks of high blood pressure and cardiovascular disease. But this research suggests the impact may extend to brain health as well.

Experts believe excess salt could contribute to inflammation in the brain, damage to blood vessels and reduced blood flow – all of which may play a role in cognitive decline.

While the exact biological mechanisms are still unclear, the findings add to growing evidence that diet plays a key role in maintaining brain health as we age.

How much is too much?

Australian health guidelines recommend adults consume no more than 2,000mg of sodium per day – roughly equivalent to one teaspoon of salt.

That limit can be reached quickly through everyday foods, including processed meals, takeaway options and packaged snacks.

What it means for you

While more research is needed, the message is simple: small dietary changes could make a difference over time.

Reducing salt intake is already known to support heart health. Now, it may also help protect memory – particularly for men.

“Our findings provide early evidence of a link between higher sodium intake and cognitive function,” Dr Gardener said. “Further research will be critical to understand how this relationship works and how it can inform future advice on reducing dementia risk.”