Obesity occurs over time when you eat more calories than you use. The balance between calories-in and calories-out differs for each person. Factors that might tip the balance include your genetic makeup, overeating, eating high-fat foods and not being physically active. It is an accumulation of excess body fat, to an extent that may impair health. It is different from being overweight, which means weighing too much. The weight may come from muscle, bone, fat and/or body water. Both terms mean that a person's weight is greater than what's considered healthy for his or her height.
Being obese increases your risk of diabetes, heart disease, stroke, arthritis and some cancers. A crude population measure of excess fat is the body mass index
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