Heredity - A family tendency exists in many cases, but it is difficult to point out genetic and environmental components. Pattern of eating and activity are influenced by social, cultural and economic factors, which may be handed on from one generation to another. In developed countries obesity is more common in the lower socio-economic group, also in developing countries it can occur in the affluent societies. Endocrine factors - Obesity frequently accompanies hypothyroidism, hypogonadism, hypopituitarism etc. Energy balance - Excess fat accumulates because there is imbalance between energy intake and expenditure.
Physical inactivity has an important role in the development of obesity.
Affluence is commonly associated with reduced energy expenditure. In many instances the development of obesity is due to a metabolic defect causing reduced energy expenditure. Drugs - The use of insulin, steroids, oral contraceptives etc commonly follows obesity. Some common causative factors are listed below Excess meal that consists excess sweet, unctuous and cold things. Eating before previously ingested food is digested.