This longitudinal study followed 85 overweight young Latino over 2 years to determine the relation between dietary fiber intake and intra-abdominal adipose tissue. Increases in total dietary and insoluble fiber were found to be associated with a reduced intra-abdominal adipose tissue. No other changes in dietary variables (energy intake, macronutrients, sugar variables, all food and beverage servings) were related to changes in adiposity variables. Surprisingly, decreases in sugar variables did not improve insulin secretion. Finally, this is the first study to demonstrate that a modest decrease of dietary fiber intake over 1 or 2 years can significantly increase intra-abdominal adipose tissue (the “dangerous” fat) in young overweight Latino. This article was accompanied by an Editorial by Lupton JR in which the author emphasized the importance to understand the effect of diet, and particularly the effect of carbohydrate source (fiber of sugar), on the distribution of adiposity which is an important predictor of cardiovascular disease and type 2 diabetes.