Researchers conducted a small clinical trial examining whether time-restricted eating patterns could benefit cognitive function in aging adults. The study involved 47 women aged 50 to 79 who were living with overweight or obesity. Over a six-month period, all participants reduced their daily caloric intake by 500 calories, with 26 women instructed to eat only within a nine-hour window—typically between 10am and 6pm—while the remaining 21 spread their meals across approximately 12 hours.
Both groups achieved similar weight loss, averaging about 7kg. However, cognitive assessments revealed differences between the groups. Women who restricted their eating to the narrow time window demonstrated better performance on spatial planning and problem-solving tests. Additionally, they showed preliminary evidence of fewer errors on memory and learning assessments, though performance on multitasking and reaction time tests was comparable across both groups.
Researchers described the observed improvements as modest but potentially significant. The benefits may relate to the timing of meals rather than diet composition alone. Experts suggest the effects could stem from interactions between circadian rhythms, metabolic processes, and inflammatory responses in the body. Notably, many people in developed nations consume food over a 14-hour period daily, leaving only 10 hours without food overnight. Prior research has associated earlier eating cessation with improvements in body weight, blood pressure, and metabolic markers.
The findings were presented at the American Society for Nutrition’s annual meeting. Researchers indicated plans to investigate the mechanisms underlying the potential cognitive benefits of time-restricted eating. Independent experts noted the work is preliminary and emphasized the need for larger, peer-reviewed studies to determine whether cognitive improvements are clinically meaningful in practical terms.
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