For the sake of safety, try not to eat raw water chestnut, and often eat raw water chestnut, in which the ginger worm will enter the human body and attach to the intestinal mucosa, which can cause intestinal ulcer, diarrhea or facial edema. As water chestnut is a cold food, it is not suitable for people with spleen and stomach deficiency and blood deficiency, and it is not suitable for long-term consumption in cold winter, so as not to damage the yang of human body by cold and cool qi. In addition, water chestnut contains more starch, so diabetics should also eat carefully. Because water chestnut grows in the mire, there are a lot of bacteria and parasite eggs on its surface, especially ginger eggs, so people who like to eat raw water must pay attention to the cleaning of water chestnut. When eating raw water, rinse it with tap water, peel it, and scald it in boiling water before eating.