No one loses weight intending to regain it quickly. Yet yo-yo dieting—repeated cycles of loss and regain—is common. Weight often returns fast, sometimes with extras.
Research consistently shows yo-yo dieting's downsides. Professor Tim Spector of King's College London warns it can lead to more weight gain long-term than never dieting. Another study linked it to disrupted gut flora, confusing the body's metabolism.
A Surprising Counterpoint
A new, controversial study in mice suggests yo-yo dieting beats staying overweight. Cycling mice outlived obese ones. The researcher compares it to dental plaque: okay if it returns after cleaning.
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