| There are many reasons why people are obese. The U.S. Centers for Disease Control and Prevention, which estimates that one-third of Americans are obese, attributes the epidemic to genes, diet, socioeconomic status, environment, and lifestyle, among other things. At BU, dozens of researchers are searching for a better understanding of the causes of, and for solutions to, a health problem associated with heart disease, stroke, type 2 diabetes, and certain types of cancer, and whose medical costs were $147 billion in 2008. In this four-part series, BU Today looks at their work in progress. | 