Obesity is a pathological state in which the number of fat cells in the body increases or the volume grows, the body fat accumulates excessively and/or is abnormally distributed, and the body weight exceeds the standard body weight by more than 20%. On the other hand, obesity is a combination of many complex conditions, such as it needs to be combined with type 2 diabetes, hypertension, dyslipidemia, ischemic heart disease, etc., so it is also a chronic metabolic disorder. Those with no obvious cause are called simple obesity. Obesity can also be one of the clinical manifestations of certain diseases (such as hypothalamic-pituitary inflammation, tumors, trauma, Cushing's syndrome, hypothyroidism, hypogonadism), also known as secondary obesity. Obesity in the elderly refers to obesity that occurs or exists in the elderly over 60 years old.