Eat sweet potato flour in excess will lead to fat, because sweet potato flour contains a large number of carbohydrates, also known as polysaccharides in medicine, into the body will be converted into monosaccharides, also known as glucose. Glucose intake is too much, in addition to providing the body to consume the necessary energy, the excess will be in the body through a series of complex biological and chemical reactions into fat storage, the body can make fat decomposition to provide a certain amount of energy when the food supply is insufficient. Eat sweet potato flour should be moderate, while the amount of staple foods should be reduced accordingly after eating sweet potato flour.