Daijiworld Media Network - Sydney

Sydney, Apr 15: A diet high in salt may accelerate memory decline in men, according to new Australian research that highlights how everyday dietary choices can influence long-term brain health.

The study, conducted by researchers at Edith Cowan University, found that increased sodium intake could negatively affect episodic memory — the cognitive function responsible for recalling personal experiences such as daily events or life milestones.

Published in Neurobiology of Ageing, the study tracked 1,208 participants over a period of 72 months, analysing baseline sodium intake alongside cognitive performance over time.

Researchers observed that men with higher salt consumption experienced a more rapid decline in episodic memory. Interestingly, the same association was not found in women, suggesting possible gender-specific biological or lifestyle differences.

While sodium is essential for normal body function, scientists note that excessive intake has long been linked to high blood pressure and cardiovascular risks. The new findings add potential neurological effects to those concerns.

Lead researcher Samantha Gardener said the exact biological mechanisms remain unclear, but suggested that high sodium levels may contribute to brain inflammation, vascular damage, and reduced blood flow to neural tissues.

In a separate but related line of research, scientists have also examined how memory recall changes over time. A study from Israel published in Communications Psychology found that while specific memories may fade, the explanations people give for remembering those events tend to remain consistent.

Researchers analysed 421 participants using linguistic tools and discovered that although detailed recall diminished over time, the structure and content of individuals’ justifications remained stable. This suggests that such explanations may serve as relatively reliable indicators of memory authenticity, even as confidence in recollections gradually weakens.

Together, the studies underscore the complex relationship between diet, brain health, and memory — and highlight the importance of lifestyle factors in maintaining cognitive function over time.