'Yo-Yo' Dieting Won't Harm Long-Term Weight Loss EffortsStudy found no differences among 'weight cyclers' and others as time went onTHURSDAY, Aug. 16 (HealthDay News) -- So-called "yo-yo" dieting -- where people repeatedly lose weight by dieting, only to regain the weight -- may be frustrating, but it will not hurt a person's ability to lose weight over the long term, a new study finds.This type of "weight cycling" does not have a negative effect on metabolism, the study found. The findings may be significant, the experts added, because yo-yo dieting affects up to 40 percent of the population in the Western world, and estimates indicate that nearly half of American women are currently dieting to lose weight."A history of unsuccessful weight loss should not dissuade an individual from future attempts to shed pounds or diminish the role of a healthy diet and regular physical activity in successful weight management," study senior author Dr. Anne McTiernan, a member of the Fred Hutchinson Cancer Research Center's Public Health Sciences Division, in Seattle, said in a center news release.......Overall, 18 percent of the women in these two groups were considered severe yo-yo dieters (they reported losing 20 or more pounds on three or more occasions), and 24 percent were moderate yo-yo dieters (they reported losing 10 or more pounds on three or more occasions).Although severe yo-yo dieters were, on average, almost 20 pounds heavier than the women who were not yo-yo dieters when the study began, at the end of the study the researchers found no significant differences between those who had a history of yo-yo dieting and those who did not.... ...Yo-yo dieting also did not affect the percentage of body fat and lean muscle mass gained or lost among the women, they noted....http://www.nlm.nih.gov/medlineplus/news/fullstory_128325.htm...
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