It’s not just about what you eat — but when you eat.
New research has found a potential link between brain health and eating schedule, determining that limiting when you chow down to certain hours of the day can help keep your cognition sharp as you age.
The research, presented at the American Society for Nutrition’s Nutrition 2026 meeting, suggests that limiting eating to an 8- or 9-hour window per day and stopping four hours before bed could improve cognitive skills in older adults.
In the study, 47 overweight and obese women aged 50 to 79 participated six-month weight loss program.
All participants were instructed to cut daily calorie intake by 500 calories. But 26 of them were also asked to consume all food within nine hours, while the rest continued eating across a typical period of 12 hours.
The time-restricted group generally ate between 10 a.m. and 6 p.m. for around eight hours a day, compared to an average of 12 hours in the standard eating group.
After six months, weight loss was similar in both groups, each losing around 15 pounds.
But those who stuck to the 8-hour window performed significantly better on tests measuring spatial planning and problem solving.
The time-restricted group also made fewer mistakes on tests involving memory and learning.
Obesity is a risk factor for cognitive decline, since excess fat tissue contributes to inflammation that can damage the brain — so dropping pounds can already help you on your way to better brain health.
“Losing weight alone will ward off some of the aging-related cognitive decline,” Sue Shapses, principal investigator of a new study, said in a press release.
But the two groups of women lost the same amount of weight yet had different cognitive test results, suggesting that the restricted eating window — a type of intermittent fasting — made the big difference.
“These outcomes suggest a better ability to remember information during everyday tasks and reducing mistakes related to memory, attention and problem-solving,” Shapses said.
While this study was small, future research can determine whether cognitive improvements apply to larger populations, as well as explain why meal timing might affect the brain.
The researchers believe several explanations could account for the modest brain boost, including interactions among circadian rhythm, inflammation, metabolic health and biological pathways that help the body sense and respond to nutrients.
Previous research that found the best times for eating to slim down your waistline were similar to the results of this study.
Eating between 6 a.m. and concluding activity by 10 p.m. aligned with the body’s natural circadian rhythms, which could enhance the body’s ability to burn fat.
