First, people with severe stomach problems can't eat natto. Natto has high purine content and can promote gastric juice secretion. Therefore, patients with peptic ulcer gastritis and chronic superficial gastritis had better not eat natto.

Second, patients with kidney disease can't eat natto. Natto contains high non-essential amino acids, which is unfavorable for patients with nephritis, renal failure and renal dialysis and cannot be eaten.

Third, people with gout cannot eat it. Because of metabolic disorder, natto contains more purines, and gout patients should try not to eat it.

Fourth, patients with acute pancreatitis can't eat. It is forbidden to eat all foods that can stimulate the secretion of gastric juice and pancreas during the attack of acute pancreatitis, so it is not suitable to eat.

People with unhealed wounds can't eat it. Nattokinase has a strong anticoagulant effect, and patients with postoperative wound disunion can easily cause wound bleeding. Therefore, these five types of people are not recommended to eat natto.