Yo-yo dieting can affect appetite hormones for up to a year

January 24, 2016

There are more than 1.5 billion overweight people in the world, including two of every three adult Americans, studies show. While cutting calories helps people reduce, few maintain the lower weight, Proietto said.

It??s not proven that the hormonal changes causes dieters to regain weight, said Donald Hensrud, the chairman of preventive medicine at the Mayo Clinic in Rochester, Minnesota. Researchers don??t know if the changes in hormone levels are appropriate given the weight fluctuation, or if they are driving appetite and weight back up, he said. Hensrud wasn??t involved in the study.

???There are examples of people who have lost weight and maintained it,??? Hensrud said. ???Until we know more, we should continue to promote the things we know - sustainable lifestyle choices, physical activity and a healthy diet. We??re not ready to turn that upside down yet.??? ???People who regain weight should not be harsh on themselves, as eating is our most basic instinct,??? said Proietto.

People who lose less than 10 percent of body weight would probably show the same thing to a lesser degree, said Dr. George Bray of the Pennington Biomedical Research Center in Baton Rouge, La. Bray concluded from this study, ???It's better not to gain weight than to try to lose it.???