The association between juvenile obesity and severe adult obesity was examined using a questionnaire completed by 73,532 weight conscious women. Relative obesity as an adult was determined by the ratio Weight/Height. The question, "Were you considered a fat child?" determined childhood weight status. Analysis of the data revealed that severely obese women (regardless of age) were 2.4 times more likely than normal weight women to have been fat children. This association was noted for all parity groups. The data also suggests that the risk of a fat child developing severe obesity is substantially greater than that for a non-fat child. Since adult obesity is associated with a number of adult diseases, this study emphasizes the importance of weight control in childhood.