Does the questioner want to ask "Are crabs with white legs and blue bodies poisonous?" poisonous. Blue crabs contain a variety of heavy metal elements. Eating blue crabs for a long time will cause a certain risk of blue mercury poisoning and cadmium poisoning. Crabs with white legs and blue bodies are blue crabs and are poisonous. Eating large amounts of blue crabs can cause disharmony in the spleen and stomach. , indigestion and other gastrointestinal problems, eating into the human body can easily cause safety hazards.