METHODS FOR VOLUNTARY WEIGHT-LOSS AND CONTROL

One quarter to one third of Americans are over-weight; as many as 40% of women and 24% of men are trying to lose weight at any given time; m any have tried a variety of methods, such as diets, exercise, behavior modification, and drugs. In controlled settings, participants who rem ain in weight loss programs usually lose approximately 10% of their we ight. However, one third to two thirds of the weight is regained withi n 1 year, and almost all is regained within 5 years. For many overweig ht persons, achieving and maintaining a healthy weight is a lifelong c hallenge. Successful weight loss improves several cardiovascular risk factors and diabetic control; effects on mortality are not clear. Seve ral epidemiologic studies have found that weight loss is associated wi th increased mortality but the reasons for weight loss were not known. Survey data also confirm that many Americans who are not overweight, particularly young women, are trying to lose weight, which may have ad verse physical and psychological consequences. Because of the importan ce of these issues, research on weight and on weight loss and control should assume a high priority on the nation's health agenda.