”Diets do not lead to sustained weight loss or health benefits for the majority of people.” said Traci Mann, UCLA associate professor of psychology and lead author of the study.
Mann and her co-authors conducted the most comprehensive and rigorous analysis of diet studies, analyzing 31 long-term studies.
“Several studies indicate that dieting is actually a consistent predictor of future weight gain,” said Janet Tomiyama, a UCLA graduate student of psychology and co-author of the study. One study found that both men and women who participated in formal weight-loss programs gained significantly more weight over a two-year period than those who had not participated in a weight-loss program, she said.
Another study, which examined a variety of lifestyle factors and their relationship to changes in weight in more than 19,000 healthy older men over a four-year period, found that “one of the best predictors of weight gain over the four years was having lost weight on a diet at some point during the years before the study started,” Tomiyama said. In several studies, people in control groups who did not diet were not that much worse off — and in many cases were better off — than those who did diet, she said.
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