Weight control is a strategy to keep us healthy and prevent future illness. It applies routinely in people who already have some type of chronic disease such as diabetes, hypertension, high cholesterol or obesity, but where else is done in cases where people need to lose weight. In addition, weight control is also very effective for patients who need to gain weight or value growth, for example, in the infant stage in circumstances where it is necessary to consider whether an adequate intake of nutrients is performed. In addition, it is also indicated for cases of eating disorders such as anorexia or bulimia, and for proper recovery from illness and surgery. However, the so-called ideal weight is associated almost always tend to lose weight imposed by modern society, although it is set by applying the formula for body mass index (BMI): weight (kg) / height (m2). This calculation indicates the weight range in which we find but is only applicable to adults. Normally it considered ideal BMI to be between 18 and 25 women, and 20 to 25 in men.