Intestinal oil is a normal phenomenon of human beings and many other animals, but too much intestinal oil will hinder the normal function of the intestine, easily cause diseases of the digestive system, and even cause obesity in severe cases, which will make people's waistline bigger and their figure bloated, and even lead to the decline of the function of the human epidemic prevention system, which seriously threatens human health. It is suggested to arrange eating habits reasonably, eat less foods rich in fat and greasy, eat more vegetables and fruits rich in plant fiber and vitamins, and develop the habit of physical exercise. It is better to do moderate exercise after meals.

Some weight-loss advertisements say that intestinal oil accumulates on the surface and inner wall of the intestine and can be absorbed by taking medicine. In fact, as mentioned above, fat only exists on the surface of intestinal tract, but not on the inner wall, so it is unscientific to say that fat is absorbed and discharged.