Crab shells are also rich in calcium salts, about 3/4 of which are calcium carbonate. Traditional Chinese medicine believes that crabs are salty and cold, and have the functions of nourishing yin and replenishing marrow, clearing away heat and resolving phlegm, nourishing tendons and promoting blood circulation, strengthening tendons and bones, preventing miscarriage, resisting tuberculosis and tonifying deficiency. Crabs should not be eaten with sweet potatoes, pumpkins, honey, oranges, pears, pomegranates, tomatoes, cantaloupes, peanuts, snails, celery, persimmons, rabbit meat and Schizonepeta; Eating crabs without cold drinks will cause diarrhea.