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'''Obesity''' is a [http://en.wikipedia.org/wiki/Medical_condition medical condition] in which excess [http://en.wikipedia.org/wiki/Body_fat body fat] has accumulated to the extent that it may have an adverse [[effect]] on [[health]], leading to reduced life expectancy and/or increased health [[problems]]. [http://en.wikipedia.org/wiki/Body_mass_index Body mass index] (BMI), a [[measurement]] [http://en.wikipedia.org/wiki/Human_weight which compares weight] and height, defines people as [http://en.wikipedia.org/wiki/Overweight overweight (pre-obese)] when their BMI is between 25 kg/m2 and 30 kg/m2, and obese when it is greater than 30 kg/m2.[3]

'''Obesity''' is a [http://en.wikipedia.org/wiki/Medical_condition medical condition] in which excess [http://en.wikipedia.org/wiki/Body_fat body fat] has accumulated to the extent that it may have an adverse [[effect]] on [[health]], leading to reduced life expectancy and/or increased health [[problems]]. [http://en.wikipedia.org/wiki/Body_mass_index Body mass index] (BMI), a [[measurement]] [http://en.wikipedia.org/wiki/Human_weight which compares weight] and height, defines people as [http://en.wikipedia.org/wiki/Overweight overweight (pre-obese)] when their BMI is between 25 kg/m2 and 30 kg/m2, and obese when it is greater than 30 kg/m2.[3]

Obesity increases the likelihood of various diseases, particularly [http://en.wikipedia.org/wiki/Cardiovascular_diseases heart disease], [http://en.wikipedia.org/wiki/Diabetes_mellitus_type_2 ]type 2 diabetes, [[breathing]] difficulties during [[sleep]], certain types of [http://en.wikipedia.org/wiki/Cancer cancer], and osteoarthritis. Obesity is most commonly caused by a combination of excessive [http://en.wikipedia.org/wiki/Food_energy dietary calories], lack of [[physical]] [[activity]], and genetic susceptibility, although a few cases are caused primarily by [[genes]], endocrine disorders, medications or psychiatric illness. [[Evidence]] to [[support]] the view that some obese people eat little yet gain weight due to a slow metabolism is limited; on average obese people have a greater energy expenditure than their thin counterparts due to the energy required to maintain an increased [[body]] [[mass]].

Obesity increases the likelihood of various diseases, particularly [http://en.wikipedia.org/wiki/Cardiovascular_diseases heart disease], [http://en.wikipedia.org/wiki/Diabetes_mellitus_type_2 type 2 diabetes], [[breathing]] difficulties during [[sleep]], certain types of [http://en.wikipedia.org/wiki/Cancer cancer], and osteoarthritis. Obesity is most commonly caused by a combination of excessive [http://en.wikipedia.org/wiki/Food_energy dietary calories], lack of [[physical]] [[activity]], and genetic susceptibility, although a few cases are caused primarily by [[genes]], endocrine disorders, medications or psychiatric illness. [[Evidence]] to [[support]] the view that some obese people eat little yet gain weight due to a slow metabolism is limited; on average obese people have a greater energy expenditure than their thin counterparts due to the energy required to maintain an increased [[body]] [[mass]].

The primary treatment for obesity is [http://en.wikipedia.org/wiki/Dieting dieting] and physical [[exercise]]. To supplement this, or in case of failure, anti-obesity drugs may be taken to reduce appetite or inhibit fat absorption. In severe cases, surgery is performed or an intragastric balloon is placed to reduce stomach volume and/or bowel length, leading to earlier satiation and reduced ability to absorb nutrients from food.[6][7]

The primary treatment for obesity is [http://en.wikipedia.org/wiki/Dieting dieting] and physical [[exercise]]. To supplement this, or in case of failure, anti-obesity drugs may be taken to reduce appetite or inhibit fat absorption. In severe cases, surgery is performed or an intragastric balloon is placed to reduce stomach volume and/or bowel length, leading to earlier satiation and reduced ability to absorb nutrients from food.[6][7]