The preferred specialty is endocrinology and metabolism because obesity itself is a metabolic disease. Besides the commonly known simple obesity, there is also a type called secondary obesity. The distinction between the two is that in simple obesity, the body does not suffer from any other disease; weight gain is merely caused by unscientific diet, irregular lifestyle, and lack of exercise, which can be resolved through some scientific methods.

Another type is called secondary obesity, such as a common disease in endocrinology called Cushing's syndrome. It is caused by a tumor or hyperplasia in the pituitary or adrenal glands, or other reasons that lead to an excessive secretion of cortisol in the blood, consequently causing a redistribution of body fat, leading to moon face, buffalo hump, and accumulation of subcutaneous fat in the abdomen.

Common in endocrinology, hypothyroidism can also lead to weight gain. This requires endocrinology specialists to diagnose and identify the specific condition in order to provide appropriate treatment.