There is no such thing as which six kinds of people should not eat natto, but natto is not suitable for hyperuricemia, gout patients and those who are allergic to natto. Natto belongs to soybean products, the purine content is relatively high, so hyperuricemia, gout patients should not be eaten, is because these two diseases of the patient itself is caused by purine metabolism malfunction, the intake of too much natto may lead to the human body uric acid levels rise, thus further aggravation of the condition, which will cause greater pain to the patient. In addition to patients with hyperuricemia and gout, people who are allergic to natto should not eat natto, or they will experience symptoms of food allergy, such as skin symptoms like erythema and windsocks, gastrointestinal symptoms like nausea, vomiting and diarrhea. Normal people can eat natto and can replenish the body with appropriate nutrients.