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Morbidly obese

Obesity
Three silhouettes depicting the outlines of an optimally sized (left), overweight (middle), and obese person (right).
Silhouettes and waist circumferences representing optimal, overweight, and obese
Specialty Endocrinology
Symptoms increased fat
Causes excessive food, lack of exercise, genetics
Diagnostic method BMI > 30 kg/m2
Treatment diet, exercise, medications, surgery
Frequency 642 million (13%)
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Classification
External resources

Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have a negative effect on health. People are generally considered obese when their body mass index (BMI), a measurement obtained by dividing a person's weight by the square of the person's height, is over 30 kg/m2, with the range 25–30 kg/m2 defined as overweight. Some East Asian countries use lower values. Obesity increases the likelihood of various diseases, particularly heart disease, type 2 diabetes, obstructive sleep apnea, certain types of cancer, and osteoarthritis.

Obesity is most commonly caused by a combination of excessive food intake, lack of physical activity, and genetic susceptibility. A few cases are caused primarily by genes, endocrine disorders, medications, or mental illness. The view that obese people eat little yet gain weight due to a slow metabolism is not generally supported. On average, obese people have a greater energy expenditure than their thin counterparts due to the energy required to maintain an increased body mass.


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