Obesity is one
of the most pervasive, chronic diseases in need of new strategies for medical
treatment and prevention. 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.