Time-Restricted Eating May Help Preserve Cognitive Function in Older Adults

National Harbor, Md. (July 26, 2026)—A small pilot trial suggests that compressing the daily eating window may help lower dementia risk, beyond the cognitive effects of losing weight alone. Investigators tested whether time-restricted eating—changing when people eat—could improve specific domains of cognition in older women at elevated risk due to overweight or obesity. Results, though preliminary, point toward a potentially actionable timing lever for brain health.

The study was led by Sue Shapses, PhD, RD, DFASN, of Rutgers University and Rutgers–RWJ Medical Center. The trial is designed around a calorie reduction strategy paired with either a narrower or typical daily eating schedule. Participants were counseled to cut 500 calories per day to standardize energy intake across groups.

Forty-seven women aged 50–79 were enrolled. All reduced calories, but 26 participants were assigned to restrict eating to a window of fewer than 9 hours per day, while the remaining group maintained an approximately 12-hour window. In practice, the time-restricted group typically ate from about 10 a.m. to 6 p.m., yielding an average eating window of 8.2 hours, compared with 12.3 hours for the control window.

After six months, both groups lost weight—about 15 pounds on average—with no meaningful difference between groups. This allowed the researchers to examine whether cognitive changes track with eating-window compression rather than weight loss per se.

Cognitive testing showed that the shorter-window group improved performance on spatial planning and problem-solving tasks at the end of the weight-loss program. A trend toward fewer errors on memory and learning measures was also observed, although multitasking and reaction-time outcomes did not differ significantly.

Shapses said the effects were modest but meaningful, linking reduced eating windows to improved ability to remember information in everyday contexts and to make fewer errors associated with memory, attention, and problem-solving. Notably, the size of the cognitive improvements increased as the eating window shortened.

Because the trial was small, the authors emphasize the need for larger, more definitive studies. They also plan mechanistic work to explain how early stopping and circadian alignment might influence nutrient-sensing pathways, inflammation, and metabolic health—processes implicated in cognitive aging.

The findings will be presented at NUTRITION 2026, the American Society for Nutrition’s flagship meeting, during the Aging and Chronic Disease (II) Poster Session on Sunday, July 26, from 9:30–10:30 a.m. EDT. The organizers note that abstracts selected for the meeting are not routinely peer-reviewed in the same way as journal articles, so the results should be considered preliminary until published in a peer-reviewed format.