There are many foods that can play a laxative role, such as apples, sweet potatoes, corn and other fruit coarse grains. Apples are rich in dietary fiber – pectin, so apples can play a two-way regulation in the laxative problem. When the stool is constipated, eating more apples can play a laxative role. The pectin in apples can absorb 2.5 times its own volume of water, making the stool soft and easy to discharge, which can relieve constipation. When the stool is diarrhea, the pectin in apples can absorb the water in the stool and make the stool thicker, thus playing a role in stopping the diarrhea. This two-way regulation of apples is very gentle, especially for the elderly and infants. In addition, sweet potatoes, corn, oats, buckwheat and other coarse grains are rich in dietary fiber, also has the effect of preventing constipation.