Obesity is considered one of the most troubling chronic diseases for public health because of its rapid growth in the population. Many are the causal factors of this epidemic, and in recent years studies suggest the involvement of genetic factors in the etiology of obesity as a risk factor for its development. Polymorphism of the FTO gene is being studied in the past eight years and has been indicated as a predictor of obesity in the population, as well as associations in food intake, raising the possibility of influence in the regulation of hunger and satiety. Accordingly, researchers observed changes in levels of postprandial leptin and ghrelin, which can promote appetite and change the quantity and quality of food intake in subjects with the polymorphism FTO.