After eating red dragon fruit stools become red is due to the red pigment along with fecal discharge, red dragon fruit is not only rich in dietary fiber, carbohydrates, but also contains a large amount of natural red pigment, in eating red dragon fruit other substances can be metabolized by the body, but the natural red pigment can only be degraded by the body, but can not be absorbed and digested by the body, so it will be accompanied by food residues transformed into feces together with excretion Therefore, it is excreted along with the food residue into feces. Since the natural pigment is not changed, it is still red when it is excreted, and the color of the stool will be accompanied by redness. The redness of the stool after eating red dragon fruit is a normal phenomenon, except for the color of the stool will change, the nature and smell of the stool will not change, and the stool will return to normal after the natural red pigment in the body is discharged. In addition to the red dragon fruit will cause the stool to become red, amaranth, tomatoes, wolfberries and other foods also contain natural red pigment, so it will also cause the color of the stool to become red.