Preliminary research suggests that limiting daily eating to an eight- to nine-hour window may modestly support cognitive health in older women. The findings matter because they point to a relatively simple dietary pattern that could potentially complement efforts to reduce age-related cognitive decline, although the study was small and does not establish cause and effect.

The six-month trial involved 47 overweight or obese postmenopausal women aged 50 to 79, all of whom were advised to cut about 500 calories a day. Women who ate within the shorter daily window showed slight cognitive improvement compared with those who spread meals across roughly 12 hours; the results were presented at the NUTRITION 2026 meeting and remain preliminary.