Sweet potatoes can prevent constipation, but there is no research information that can prevent the occurrence of bowel cancer. Sweet potatoes contain a large amount of dietary fiber and more starch, after eating can absorb a lot of water in the intestinal tract, thus increasing the volume of feces, promote intestinal peristalsis, promote defecation, and have a certain degree of benefit in relieving constipation. Patients with long-term constipation have a higher risk of developing bowel cancer than normal people. When patients have a smooth bowel movement, it can reduce the body’s absorption of intestinal toxins and reduce the occurrence of intestinal diseases, such as bowel cancer. However, there is no clear research information that sweet potatoes can prevent bowel cancer. Although the dietary fiber in sweet potatoes may have the effect of preventing constipation, it is not suitable for everyone, especially those who are prone to allergies.