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Menopause Health Center

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Weight Regained in Later Years Has More Fat

Study: If Postmenopausal Women Lose Weight, They're Better Off if They Keep It Off
By Rita Rubin
WebMD Health News
Reviewed by Laura J. Martin, MD

Dec. 16, 2011 -- As you draw up your New Year’s resolutions, new research may provide added incentive for some older women to not only lose weight, but to keep it off.

The study of postmenopausal women suggests that when they regain weight -- and previous research suggests about 80% of dieters eventually do -- they don’t recover as much lean mass as they lost. As a result, they end up with more fat, even if they’re about the same weight as they were before the diet.

People lose lean tissue as well as fat when they shed pounds, the authors of the new study write. In fact, they write, studies have found that lean tissue represents roughly a quarter of total weight loss. Because the loss of muscle and bone can be especially detrimental to older people, “it is important to examine whether the benefits of weight loss outweigh the risks in this population.”

The scientists analyzed the body composition of 78 non-active postmenopausal women, ages 50-70, before and immediately after they’d completed a five-month-long diet. The researchers then weighed the women six and 12 months after the weight loss trial ended and analyzed the body composition of those who regained at least 4.4 pounds.

Most Regained Some Weight

On average, the women had lost about 12% of their body weight. By the six-month follow-up, about two-thirds of the women had regained some weight; by the 12-month follow-up, about three-quarters had, including 11 women who had gained more than they had lost.

After one year, 84% of the regainers had put on more than the benchmark of 4.4 pounds. Those were the women whose body composition was analyzed.

The women had lost twice as much fat as muscle when they were on a low-calorie diet. But afterward, they regained more than four times as much fat as muscle.

Previous studies of weight cycling were done in younger people, who tended to regain fat and lean tissue in the same proportion as they’d lost it, says researcher Barbara Nicklas, PhD, professor of geriatrics and gerontology at the Wake Forest School of Medicine.

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