There is no such thing as which four types of people should not eat blackfish. Most people can generally eat blackfish, but people who are allergic to blackfish as well as those who have gout attacks should not eat blackfish. Blackfish is a common seafood with certain nutritional value. Blackfish contains 18.5% protein, 78.7% water, 26.0μg of vitamin A and other ingredients, which can supplement the nutrients contained in the body and maintain the normal physiological function of the body. However, if one is allergic to blackfish, one should not eat blackfish to avoid food allergy and symptoms such as itchy skin, cough and shortness of breath. In addition, because of the high purine content of blackfish, so gout patients should not eat blackfish when they have an attack, otherwise it will aggravate the disease. You need to strengthen your dietary management in your normal life and know the relevant dietary taboos beforehand so as not to adversely affect your health.