Study: 8-Hour Eating Window Shows Lasting Weight Loss Benefits Over 12 Months

By Dr. Marcus Chen, Ph.D.

May 13, 2025 at 06:37 AM

Time-restricted eating (TRE) can lead to sustainable weight loss and improved cardiometabolic health, according to new research presented at the European Congress on Obesity. The study followed 99 adults with overweight or obesity for 12 months in Granada, Spain.

Cutting avocado toast with egg salmon

Cutting avocado toast with egg salmon

Key findings:

  • Participants following an 8-hour eating window lost 3.5-4.5% of body weight (about 8 pounds) in 3 months
  • Weight loss was maintained for up to one year
  • High adherence rates (85-88%) due to simplified approach
  • Benefits occurred regardless of early or late eating window timing
  • Early TRE group showed the most substantial reductions in waist and hip measurements

TRE Benefits:

  • Reduces snacking and overall calorie intake
  • No calorie counting required
  • Can be adapted to individual schedules
  • May improve glucose intolerance and insulin resistance
  • Potential reduction in inflammation

Possible Side Effects:

  • Hunger
  • Headaches
  • Lightheadedness
  • Fatigue
  • Dehydration

Important Considerations:

  • Not suitable for people over 75 or pregnant women
  • Consult physician before starting, especially with existing health conditions
  • Effects may vary among individuals
  • Long-term safety still being studied
  • Medical supervision recommended for those with diabetes or hypertension

The research suggests TRE offers a simplified alternative to traditional dieting, potentially leading to lasting behavioral changes and improved metabolic efficiency. However, larger, multiyear trials are still needed to fully understand long-term benefits and safety.

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