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Home » Lose Weight » Long-term weight loss not affected by yo-yo dieting: study

Andrea Janus, CTVNews.ca Published Sunday, Aug. 19, 2012 7:30AM EDT

Dieters who have trouble sticking with a weight-loss plan take heart: a new study suggests that so-called yo-yo dieting appears to have little effect on the ability to lose weight over the long term.

Experts believe that repeated cycles of weight loss and gain, which is also known as weight cycling, affects anywhere between 10 and 40 per cent of the population in Western countries.

But it has long been up for debate whether that pattern has a negative impact on metabolism and the long-term ability to shed pounds.

The new study was conducted by researchers at the Fred Hutchinson Cancer Research Center in Seattle. They culled data from 439 women who were classified as overweight or obese, sedentary, and between the ages of 50 and 75.

Of the participants, 18 per cent met the criteria for severe weight cycling (they reported losing 20 or more pounds on three or more occasions) while 24 per cent met the criteria for moderate weight cycling (losing 10 or more pounds on three or more occasions).

All participants had been randomly assigned to one of four groups for a year-long weight-loss program designed to help them shed 10 per cent of their starting weight: reduced-calorie diet only, exercise only, reduced-calorie diet plus exercise, and a control group that included neither diet nor exercise.

After the year, the subjects in the diet-only and diet and exercise groups met the weight-loss goal. And when the researchers compared the weight cyclers to the non-cyclers, they found no difference between the two groups in terms of weight loss, body-fat percentage and lean muscle mass gained or lost.

They also found that the cyclers and non-cyclers were equally successful at sticking with the year-long program. And health markers such as blood pressure and insulin sensitivity were not significantly different between the two groups.

The study is published in the journal Metabolism.

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Long-term weight loss not affected by yo-yo dieting: study

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Home » Lose Weight » Long-term weight loss not affected by yo-yo dieting: study