Obesity, also known as adiposis, is a chronic metabolic disease caused by excessive accumulation or abnormal distribution of fat in the body. It results from the interaction of multiple factors including genetic and environmental factors that cause fat accumulation. Primary obesity, also known as simple obesity, is the most common type and is mainly caused by poor dietary habits, such as excessive food intake, particularly excessive fats, and a sedentary lifestyle. There is also secondary obesity, which is generally caused by diseases of the endocrine system. Hormonal treatments for allergic diseases and rheumatic diseases can also lead to secondary obesity.