Restricting daily food consumption to a specific time window may contribute to improved cognitive function in older adults, according to new research. A study presented at the American Society for Nutrition's Nutrition 2026 meeting suggests that limiting eating to an eight- or nine-hour window and concluding meals at least four hours before bedtime could enhance cognitive skills.
The research involved 47 overweight and obese women aged 50 to 79 who participated in a six-month weight loss program. All participants were instructed to reduce their daily calorie intake by 500 calories. Of this group, 26 women were asked to consume all their food within a nine-hour period, while the remaining participants followed a more typical eating schedule spread over 12 hours. The time-restricted group generally ate between 10 a.m. and 6 p.m., an average of eight hours daily, compared to the 12-hour average for the standard eating group.
While both groups achieved similar weight loss, averaging around 15 pounds over six months, the women adhering to the eight-hour eating window demonstrated significantly better performance on tests measuring spatial planning and problem-solving. This group also made fewer errors on memory and learning assessments.
Obesity is a known risk factor for cognitive decline due to inflammation associated with excess body fat that can damage the brain. While weight loss itself can contribute to better brain health, the study's findings suggest that the timing of meals played a crucial role. "These outcomes suggest a better ability to remember information during everyday tasks and reducing mistakes related to memory, attention and problem-solving," stated Sue Shapses, the principal investigator of the study.
Researchers are exploring several potential explanations for the observed cognitive benefits, including the interplay between circadian rhythms, inflammation, metabolic health, and biological pathways that regulate nutrient sensing and response. Previous research has indicated that aligning eating patterns with the body's natural circadian rhythms, such as eating between 6 a.m. and finishing by 10 p.m., may enhance the body's fat-burning capabilities, aligning with the findings on meal timing's impact on metabolism and potentially cognitive function.