Limiting food intake to an eight-to-nine-hour daily window may protect planning and problem-solving skills in older women even when weight loss is identical, , according to a clinical trial published on Current Developments in Nutrition (Vol. 10, Supplement 1, July 2026) which was presented as abstract at NUTRITION 2026, the American Society for Nutrition's flagship annual meeting.
The six-month pilot trial, led by Sue Shapses, PhD, of Rutgers University, followed 47 women aged 50 to 79 with overweight or obesity. All participants cut daily calories by 500, but 26 women were also instructed to eat within fewer than nine hours each day (averaging 8.2 hours, roughly 10 a.m. to 6 p.m.), while the rest ate across a typical 12.3-hour window. After six months, both groups lost roughly 15 pounds but the time-restricted group scored significantly better on tests measuring spatial planning and problem solving.
It has been a long established factor that losing weight will ward off some aging-related cognitive declines, now these new clinical trial data suggest there may be additional benefits if you stop eating four hours prior to going to sleep. The results, presented at the American Society for Nutrition's flagship meeting, add to growing evidence that when we eat may matter for brain health as much as what and how much particularly for women and people with obesity, who face higher dementia risk.