A new study presented at NUTRITION 2026, the annual meeting of the American Society for Nutrition, suggests that when people eat may be just as important as what they eat when it comes to protecting brain health. The study found that older women who limited their meals to an eight- or nine-hour window each day showed modest improvements in memory, problem-solving, and planning skills compared with women who ate over a more typical 12-hour period.

Methodology and Findings

The six-month clinical trial included 47 women between the ages of 50 and 79 who were overweight or obese, both factors associated with an increased risk of cognitive decline and dementia. All participants were instructed to reduce their daily calorie intake by 500 calories as part of a weight-loss program. However, 26 women were also asked to consume all of their meals within an eating window of less than nine hours per day, typically between 10 a.m. and 6 p.m.

By the end of the six-month study, both groups had lost roughly the same amount of weight — about 15 pounds on average. Despite similar weight loss, researchers found important differences in cognitive performance. Women who followed the eight- to nine-hour eating schedule performed significantly better on tests measuring spatial planning and problem-solving than those who maintained a longer eating window.

Implications and Future Research

Researchers believe the benefits could be related to several biological processes, including improved circadian rhythm, reduced inflammation, better metabolic health, and changes in nutrient-sensing pathways. While the results are encouraging, researchers caution that the study was small and does not prove that time-restricted eating prevents dementia. Larger studies will be needed to confirm the findings and explore the biological mechanisms that may explain why limiting daily eating hours could help support brain health.

Original reporting: The Dallas Express — read the source article.