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"Yo-Yo" Dieting Weakens Your Immune System

  • June 01, 2004

Yo-yo dieting, in which a person repeatedly loses and regains weight, may have a lasting negative impact on immune function. Conversely, maintaining the same weight over time appears to have a positive effect on the immune system. It appears that long-term immune function decreases in proportion to how many times a woman intentionally loses weight, while immune function--as measured by natural-killer-cell activity--was higher among women who had been fairly weight stable over several years...