Eating within 8 hours may help keep the aging brain sharp
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- Sue Shapses and colleagues at Rutgers University presented a six-month pilot trial of 47 women ages 50-79 with overweight or obesity at NUTRITION 2026, finding those eating within an 8-9 hour window scored significantly better on spatial planning and problem-solving tests than those eating across roughly 12 hours.
- Both study groups lost a similar average of about 15 pounds over six months, indicating the cognitive edge came from meal timing rather than weight loss alone.
- Time-restricted participants generally ate between 10 a.m. and 6 p.m., averaging 8.2 hours daily versus 12.3 hours in the comparison group, and made fewer errors on memory and learning tests—though that difference fell short of statistical significance.
- The pilot found no significant differences between groups on reaction time or multitasking, and researchers called the cognitive gains 'modest' and emphasized the findings are preliminary and not yet peer-reviewed.
- Possible mechanisms flagged by Shapses include circadian rhythm alignment, reduced inflammation, and metabolic and nutrient-sensing pathways, with larger trials needed to confirm the results.
Why it matters: For older women with overweight—a group with elevated dementia risk—compressing meals to 8-9 hours daily offered a modest cognitive edge on top of equivalent weight loss, positioning meal timing as a testable behavioral add-on to standard calorie-cutting advice.
