Study: ‘yo-yo dieting’ can weaken immune system

Filed under: Study — Tags: — @ June 2, 2004

According to a new study by the Fred Hutchinson Cancer Research Center, “yo-yo dieting”–repeatedly losing, then regaining weight–may harm a woman’s immune system. The study also found that maintaining the same weight over time appears to have a positive effect on a woman’s immune system.

bq. The study… measured natural killer cell activity in the women’s blood. Natural killer cells are an essential part of the immune system, killing viruses and leukemia cells.

Those who reported losing weight more than five times had about a third lower natural killer cell function. Conversely, women who maintained the same weight for at least five years had 40 percent greater natural killer cell activity as compared to those who maintained their weight for fewer than two years.


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