Because the stool is mainly composed of food digestion, so through dietary regulation to prevent constipation is a simple and easy way: 1, to pay attention to the amount of diet, only enough to stimulate intestinal peristalsis, so that the normal passage of stool and excretion. In particular, breakfast should be full. Patients with spastic colon should avoid eating large meals, so as not to expand the digestive tract, making constipation more serious. 2, to pay attention to the quality of the diet, the main food should not be too fine, pay attention to eat some coarse grains and grains, because coarse grains, grains after digestion residue, can increase the amount of stimulation of the intestinal tube, conducive to the operation of the stool. Side dishes should pay attention to eat more vegetables containing more fiber. You can eat more green vegetables, leeks, celery, sweet potatoes, etc.. Because fiber is not easily digested and absorbed, the amount of residue can increase the volume of the intestinal tube, improve the pressure in the intestinal tube, increase intestinal peristalsis, which is conducive to defecation. 3, pay attention to certain foods may make some people constipated, but for others have no effect or just the opposite. For example, milk may make some people severely constipated, but make others dysentery. If your constipation is caused by colon spasms, you should avoid foods that tend to cause gas, such as beans, white cauliflower, collard greens. If your constipation is severely painful, you may have spastic colon. 4, but also drink more water, especially heavy workers, because of sweating, breathing, water consumption, water in the intestinal tube is bound to be absorbed in large quantities, so to prevent dry stool you have to drink more water. A glass of water before breakfast or after waking up has a mild laxative effect. Drink enough water to make the intestine get enough water can facilitate the passage of intestinal contents. In addition, you can intentionally eat more food containing fat, such as walnuts, peanuts, sesame, canola oil, peanut oil, etc., they have a good laxative effect.