Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have a negative effect on health, leading to reduced life expectancy and/or increased health problems.
People are 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, exceeds30 kg/m2, with the range 25-30 kg/m2 defined as overweight.
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 energy intake, lack of physical activity, and genetic susceptibility, although a few cases are caused primarily by genes, endocrine disorders, medications, orpsychiatric 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 and overweight pose a major risk for serious chronic diseases that include:-
Type 2 diabetes
High blood pressure
Gall bladder stones
Fatty liver disease
Some forms of cancers like breast, endometrium (womb) and colon (bowel cancers)
Obesity results in an increased risk of premature death as well as reduction in overall quality of life.