Blueberries do not cure constipation, blueberries contain anthocyanins, but constipation patients need fiber. Fiber is the main component in the formation of stool, blueberries have laxative function, but can not treat constipation, and blueberries should not be eaten more, not on an empty stomach, because it will stimulate the secretion of stomach acid. Patients with constipation are advised to eat more fiber-rich foods, such as leafy greens, commonly spinach and celery, and need to eat 1 pound a day. In addition, you can also eat coarse grains, such as sweet potatoes, corn, corn to eat old corn, do not eat sweet corn, because the high fiber content of old corn is conducive to relieving constipation.