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Causes
By Mayo Clinic staffAlthough there are some genetic and hormonal causes of childhood obesity, most excess weight is caused by kids eating too much and exercising too little. Children, unlike adults, need extra nutrients and calories to fuel their growth and development. So if they consume the calories needed for daily activities, growth and metabolism, they add pounds in proportion to their growth. But children who eat more calories than needed gain weight beyond what's required to support their growing bodies.
Far less common than lifestyle issues are genetic diseases and hormonal disorders that can predispose a child to obesity. These diseases, such as Prader-Willi syndrome and Cushing's syndrome, affect a very small proportion of children. In the general population, eating and exercise habits play a much larger role.
