Nutrition, Exercise,
and Behavior

Ten years have passed since the publication of the first edition of this text. Since

that time, we have learned more about the incidence, prevalence, and consequ-
ences of obesity/overweight and eating disorders; we have seen updates to Dietary

Guidelines, the food pyramid, and recommended nutrient intakes and have been given
revised exercise guidelines. Additional physiological factors affecting weight have been
discovered and treatment approaches evolved. And yet, obesity is still on the rise.