Despite earlier concerns, dieters who repeatedly lose weight and then gain it back aren't at higher risk of early death than people who don't "yo-yo diet," according to a new report.
About two-thirds of Americans are overweight or obese, and many are trying to shed the extra pounds. Over the long term, however, most people who lose weight through dieting regain it later.
The health effects of such weight cycling, also called yo-yo dieting, are a matter of controversy.
Several studies have found that people whose weight cycles up and down tend to die earlier. But the majority of that research failed to differentiate between intentional weight loss and weight loss due to disease such as cancer, researchers write in the new report.
In the current work, nearly 56,000 men and more than 66,000 women answered questions about how often they had intentionally lost 10 or more pounds and later regained the weight. The participants were between 50 and 74 years old when the study started in 1992.
During a 16-year follow-up period that ended in 2008, roughly 15,000 men and 10,000 women died.
A total of 42 percent of men and nearly 57 percent of women in the study reported intentionally losing and then regaining at least 10 pounds one or more times in their life.
Among women whose weight yo-yoed the most -- 20 times or more -- 16 percent died over the study, compared to 15 percent of those who said their weight never cycled due to dieting.
For men, the corresponding numbers were 29 percent and 26 percent.