Researchers have identified a potential cognitive benefit associated with confining eating to a nine-hour window and avoiding food for four hours before bedtime, according to findings presented at a recent nutrition conference.
The pilot study involved 47 women aged 50 to 79 with overweight or obesity who reduced their daily calorie intake by 500 calories over six months. Within the group, 26 participants were advised to restrict eating to a nine-hour window, typically between 10am and 6pm, while the remaining volunteers spread meals across approximately 12 hours. Both groups achieved similar weight loss, averaging about 7 kilograms, but cognitive assessments showed differences in mental performance.
Participants who followed the restricted eating schedule demonstrated superior performance on spatial planning and problem-solving tests. Additionally, the group showed signs of fewer errors on memory and learning assessments, though results on multitasking and reaction time measures were comparable between groups. Researchers described the observed improvements as modest but suggested they may indicate enhancements in everyday memory function and reductions in mistakes related to attention and problem-solving.
Experts emphasize that the findings remain preliminary and require confirmation through larger, more rigorous studies. The research team plans to explore the mechanisms underlying any cognitive benefits, which may involve complex interactions between circadian rhythms, metabolic processes, and inflammatory responses. The potential connection between eating timing and brain health has drawn interest from nutritionists, who note that many Western populations typically consume food across 14-hour periods with only 10 hours of overnight fasting. Previous research has associated earlier meal completion times with improvements in weight management and metabolic health indicators.
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