Health and Fitness | Chapter 2 Preface

According to the American Medical Association, 30 percent of adult Americans are overweight. Many public health officials believe that these individuals suffer adverse health effects due to their excess weight. For example, the U.S. Department of Health and Human Services reports that obesity is associated with "an increased risk for diabetes, heart disease, stroke, hypertension, gallstones, and certain types of cancer."

Losing weight, however, has proven to be extremely difficult for large numbers of people. Diets—including the major weightloss programs offered by Weight...

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