There are a number of environmental, psychological, hormonal, metabolic and social factors (among others) that contribute to the development of obesity. The progressive nature of the disease means that an imbalance in one of these factors that leads to obesity eventually imbalances all the factors in question, leading to a vicious cycle where weight loss options becomes significantly limited. If you are obese and concerned about your weight, it is necessary to speak with your doctor to discuss your options and which is the best fit.