The side effects of eating black beans for a long time are as follows: 1, may cause a high incidence of urinary stones, because black beans as a legume, which is rich in calcium, if excessive intake will cause too much calcium in the form of stones stored in the body, which will endanger health. 2, may increase the burden on the kidneys, because black beans are rich in protein and phosphorus elements, too much protein and phosphorus into the body after The actual fact is that the kidneys may be burdened, which may cause other metabolites to accumulate in the body and not easily discharged from the body, the impact on the health of the body is also more dangerous.