Intermittent Fasting Matches Calorie Restriction on Weight but Cuts Food Preoccupation in RCT

Participants were assigned to 20-hour fasting windows three days weekly, 70% energy restriction daily, or no restriction. After the intervention period both active arms lost approximately 3-4 kg with no significant difference between them. The fasting arm, however, showed lower scores on validated measures of food preoccupation and reported less need to track intake explicitly. The design targeted individuals with repeated prior diet attempts. Reduced decision load around meal timing appears to have lowered cognitive effort compared with continuous calorie tracking, a pattern also noted in a 2022 JAMA Internal Medicine crossover trial of time-restricted eating. This may explain why adherence metrics favored fasting among chronic dieters despite identical energy deficits. Longer trials are required to test whether the psychological advantage persists beyond six months and whether fasting alters cardiometabolic markers differently once weight stabilizes. Future studies should stratify by baseline eating-behavior scores and include diabetic cohorts excluded here. Regulatory and guideline bodies will need data from multi-year effectiveness trials before endorsing fasting as a default option for weight management.