The bagel section at Elisabetta Politi's neighborhood supermarket says it all. Six months ago, shelf space devoted to the onetime low-fat staple of health fanatics took up three long yards. Today, it's less than half that."People are not buying rice, bread, pasta, and bagels as much as before," observes Politi, the nutrition manager of the Duke Diet & Fitness Center.

If nearly two thirds of Americans are overweight, and one third of those individuals are obese, just where do you fit in? And what does your weight mean for your health?