Dead crabs are absolutely inedible. When a crab is dying or already dead, the histoxic acid in the crab's body will decompose to produce histamine. The longer the crab has been dead, the higher the histamine content will be. The histamine that enters the human body reaches a certain concentration, it will cause poisoning, even if the crab is cooked, this toxin is not easy to be destroyed.

Additionally, when eating crab can not eat these foods at the same time: crab and pear phases, the two with the stomach; crab and eggplant phases, the two with the stomach; crab and peanut phases, easy to lead to diarrhea; crab and cold food phases, will lead to diarrhea; crab and loach phases, causing gastrointestinal discomfort, poisoning; crab and pomegranate phases, stimulate the stomach and intestines, abdominal pain, nausea, vomiting and other symptoms; crab And melon grams, easy to lead to diarrhea; crab and groundnut grams, easy to condense into persimmonite in the body; crab and pumpkin grams, the same food will cause poisoning; crab and celery grams, the same food will affect the absorption of protein; sea crabs and jujube grams, the same food is prone to suffer from heat and cold disease; hairy crabs and ice grams, the same food will cause poisoning.