Obesity is one of the most common diseases of modern society, caused by bad eating habits that cause a metabolic disorder in the form of excess fat and consequently overweight. If the caloric intake that provides the body is greater than that required or consumed is stored as fat. Besides, obesity may result in the acquisition of other diseases, such as diabetes mellitus, hypertension, high cholesterol or cardiovascular risk. In any case, obesity treatment tailored to each person according to their age, physique, medical history and daily habits is required. By measuring the body mass index patient's degree of obesity it is known and established a slimming diet should be low calorie, low fat, with the establishment of a rehabilitation plan of eating habits and exercise. The tandem diet-exercise physical is essential for weight loss.