Water chestnut is an aquatic plant, and its surface is often attached with pathogenic microorganisms such as ginger worms. Many people chew the skin with their mouths when eating water chestnut, and ginger worms can easily enter the human body and induce ginger worm disease. Patients may have symptoms of digestive dysfunction such as abdominal pain, diarrhea, nausea, vomiting, constipation, thin stool, foul smell, etc. Children may also have symptoms such as emaciation, edema, anemia and abdominal distension, which will affect normal growth and development for a long time.

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Water chestnut should not be eaten raw as far as possible to avoid contracting Jiang Ye's disease. If you want to eat it raw, soak it in potassium permanganate solution before eating it, and then rinse it with water.

People with weak spleen and stomach, loose stools and kidney yang deficiency had better not eat water chestnut.