Research links diet and gut health to brain aging rates

Recent scientific studies have identified new links between lifestyle, biology, and the rate of brain aging.

Researchers from Murdoch University and Alzheimer’s Research Australia found that a common Alzheimer’s risk gene may influence how diet affects cognitive health. In a study of older adults in Western Australia, those carrying the risk gene experienced a faster loss of attention when consuming diets high in processed meats, sweets, refined grains, and other Western-style foods.

Separately, UCLA Health researchers have identified a connection between the Brain Aging Index (BAI) and gut health. By analyzing brain scans and stool samples from nearly 1,500 adults, the study found that individuals whose brains appeared older than their chronological age often had specific gut bacteria and metabolic byproducts. This accelerated brain aging was associated with lower levels of the hormone estetrol and poorer performance in working memory, executive function, and mood.