Frequent dieting increases the risk of obesity and weight gain- according to a study from the University of Helsinki in Finland. Researchers examined the effects of dietig on the risk of obesity and weight gain over a 25-year period. The more often a person dieted, the greater the risk of obesity and weight gain. The effects were independent of genetics. Dieting promotes weight gain because it encourages preoccupation with food, supresses the metabolic rate, and places an overemphasis on weight gain rather than weight maintenance. Genetic factors are important in the risk of obesity, but frequent dieting makes you fat.