Recent research indicates that eating within a limited timeframe each day may enhance brain health as individuals age. This preliminary study, shared at the NUTRITION 2026 conference in Maryland, found that older women who restricted their eating to an eight to nine-hour window displayed slight cognitive improvements compared to those who took about 12 hours to eat their meals.
In a six-month trial involving 47 obese or overweight postmenopausal women aged 50 to 79, participants were instructed to cut their caloric intake by roughly 500 calories. They were split into two groups: one ate within an average of 8.2 hours (typically from 10 a.m. to 6 p.m.), while the other indulged over a 12.3-hour period, as mentioned in a news release.
Both groups managed to lose about 15 pounds over the trial, but those on the shorter eating schedule performed better on cognitive assessments that evaluated spatial planning and problem-solving. They made fewer errors in memory and learning tests, although there weren’t significant differences in reaction time or multitasking capabilities.
Lead researcher Dr. Sue Shapses, a professor at Rutgers University, commented that these results suggest improved memory during everyday tasks and fewer cognitive mistakes. She noted, “Reductions in the eating window predicted greater improvements.” While the study involved a small participant size, researchers believe that time-restricted eating could benefit brain health by regulating circadian rhythms, lowering inflammation, and enhancing metabolic health.
Dr. Shapses mentions that losing weight on its own can help mitigate aging-related cognitive decline. Moreover, it seems beneficial to stop eating four hours before sleep and condense food intake to eight to nine hours a day rather than the usual twelve.
Women, particularly those who are overweight or obese, are at a higher risk of developing Alzheimer’s disease and other dementia types as they age, according to the study. Lauri Wright, a director at the USF College of Public Health, emphasized that this study sheds light on the importance of both meal timing and food choices for cognitive health.
She cautioned, however, that more comprehensive and longer-term studies are needed before making specific dietary recommendations based on meal timing. She added that intermittent fasting, while promising, needs further exploration regarding its effects on the brain.
Experts are investigating how intermittent fasting could positively influence brain function, considering various biological mechanisms. For example, longer breaks between eating times might improve insulin sensitivity, decrease chronic inflammation, and promote healthy circadian rhythms, all of which could benefit brain aging.
Practically speaking, limiting eating to a shorter window can also lead individuals to consume fewer calories, thus potentially supporting weight loss. This is something New York-based holistic nutritionist Robin DeCicco pointed out, noting that maintaining a healthy weight is crucial for overall well-being. Fasting can lower inflammation markers and reduce oxidative stress, benefiting one’s health.
DeCicco observed that many individuals feel better when practicing fasting, especially those with inflammation-related conditions such as Alzheimer’s or other neurological disorders. She articulated that allowing the organs to have a break from digestion can contribute to overall health.
While intermittent fasting offers potential benefits, it’s important to recognize that healthy cognitive aging also relies on regular exercise, sufficient sleep, blood pressure management, a balanced diet, and strong social connections—all factors that hold more substantial evidence for supporting cognitive function long-term.
Dr. Wright cautioned that intermittent fasting may not suit everyone, particularly children, teens, pregnant or breastfeeding women, individuals with a history of eating disorders, and those with diabetes on insulin. Expert advice is recommended for anyone considering fasting, especially those on certain medications or with specific health conditions.
