Black beans contain many nutrients needed by the human body, can be supplemented by eating black beans to the nutrients needed, the following groups of people may be because of their own constitution or disease and other reasons, not suitable for eating often or a lot of black beans: 1, gastrointestinal function is weak: black beans are more difficult to digest, gastrointestinal function is weak people are not recommended to eat a lot of black beans, a large number of black beans can not be digested, easy to aggravate the gastrointestinal tract reaction, causing abdominal distension; 2 The kidney function is not complete: black beans are rich in protein, protein metabolites for urea nitrogen, a large number of urea nitrogen production will increase the metabolic burden on the kidneys, may lead to increased kidney function damage; 3, liver failure: black beans in the body of protein will be converted into amino acids, amino acid digestion, the need in the liver will be toxic ammonia processing for non-toxic urea. Liver failure patients can not handle a large amount of ammonia, a large number of ammonia gathered in the body will cause ammonia poisoning, may lead to hepatic encephalopathy; 4, gout patients: black beans contain a large number of purines, purines increase will cause uric acid to rise, gout patients if long-term or large consumption, will aggravate the symptoms of gout, is not conducive to the treatment of gout. In addition to the above groups, children are not recommended to eat too much black beans, most of the rest of the population can eat black beans, but it is recommended to eat in moderation, avoid eating too much.