Usually, constipated patients can eat both soluble and insoluble dietary fiber. Because soluble dietary fiber is a kind of fiber that can be dissolved in water and can be fermented by microorganisms in the colon, so when constipated patients eat it, it can moisturize the intestinal tract to a certain extent, reduce the retention time of excrement in the intestinal tract, increase the water of excrement, and then alleviate the symptoms of constipation. Therefore, constipation patients can eat soluble dietary fiber. At the same time, constipation patients can also eat insoluble dietary fiber. Because insoluble dietary fiber can not be dissolved in water, nor will it be fermented by microorganisms in the colon, so when patients with constipation eat, it can promote intestinal peristalsis, but also to a certain extent to increase the volume of excretion, thus prompting the excretion of excreta as soon as possible to alleviate the symptoms. Constipated patients can consume more fresh vegetables and fruits, soybeans, oats and other foods in their daily life, so as to increase the supplementation of soluble and insoluble dietary fiber.