A shorter daily eating window may offer more than weight-loss benefits for older adults. Preliminary findings presented at NUTRITION 2026 suggest that older women who ate within eight to nine hours a day showed modest cognitive improvements compared with women who ate across about 12 hours.
The six-month pilot study included 47 postmenopausal women ages 50 to 79 who were overweight or obese. All participants were told to cut about 500 calories per day, and the group that restricted meals to an average 8.2-hour window, usually from 10 a.m. to 6 p.m., performed better on certain cognitive tests than the group with a 12.3-hour eating window.
Both groups lost about 15 pounds over six months. But the shorter-window group did better on tests of spatial planning and problem-solving, and it made fewer errors on memory and learning tasks.
“These outcomes suggest a better ability to remember information during everyday tasks and reduce mistakes related to memory, attention and problem-solving,” lead researcher Sue Shapses, a professor at Rutgers University and Rutgers-RWJ Medical Center, said in a press release. She said reductions in the eating window predicted greater improvements.
Shapses said meal timing may be one piece of the puzzle, not a miracle fix. She noted that losing weight alone can help ward off some age-related cognitive decline, and that stopping food intake about four hours before bed may add benefits.
Lauri Wright, director of nutrition programs and associate professor at the USF College of Public Health, said the research is interesting because when people eat may matter in addition to what and how much they eat. She added that larger, longer studies are needed before time-restricted eating can be recommended specifically to improve brain health.
Wright also said several biological mechanisms could be at work. Those may include better insulin sensitivity, lower inflammation, healthier circadian rhythms and more time for cellular repair and maintenance.
New York-based certified holistic nutritionist Robin DeCicco said a shorter eating window often helps people consume fewer calories and lose weight. She said fasting may also lower markers of inflammation and oxidative stress, while giving the organs and digestive system a chance to rest.
Experts cautioned that intermittent fasting is not right for everyone. Wright said it should be avoided by children, teens, pregnant or breastfeeding women, people with a history of eating disorders and some people with diabetes who take insulin. DeCicco added that fasting should be monitored by a medical professional, especially for people with certain health conditions or medications.