Repeated dieting makes future weight loss harder. Research by Fothergill on “Biggest Loser” contestants showed severely suppressed metabolic rates years later. The body adapts through reduced metabolism, increased hunger hormones, and efficient fat storage. Each yo-yo cycle may strengthen these defenses. Fasting appears to avoid some adaptations by preserving metabolic rate.
This companion covers the body’s defense systems, the yo-yo effect, why fasting may differ, and the practical implications. (3 min read)