WebMD - Your genes are why your eyes are brown and your hair is red. They’re what make you, well, you. But can genetics determine the size of your jeans?
"Obesity is a very complex disease, and many factors can contribute to it and cause it, including genetics, behavior, and environment," says Naima Moustaid-Moussa, PhD, director of the Obesity Research Cluster at Texas Tech University. Obesity can run in families -- not because of genetics, but because of habits and environment, she says.
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