Crabs contain a lot of proteins,which means that when eating crabs and persimmons or tomatoes at the same time,the protein and tannin in persimmon may solidify into a non-digestible material in the human stomach.At the same time,there is convergence in the role of tannic acid,which contains a prohibitor secretion of fluid that furthers the time of non-digestible materials in the intestines,thus causing heavy breathing,abdominal pain,vomiting and diarrhea.