A six-year study of 746 older adults with metabolic syndrome found that following a Mediterranean diet significantly slowed cognitive decline by promoting beneficial gut bacteria. Higher adherence to the diet was linked to greater microbial diversity and specific bacteria that produce anti-inflammatory compounds. Participants with better Mediterranean diet adherence and healthier gut microbiome signatures maintained sharper memory, attention, and executive function over time. The research suggests the Mediterranean diet's brain-protective effects work partly through the gut-brain connection, offering a practical approach to preserving cognitive health during aging.
