1. serious gastric disease

Natto contains high purine content, and people suffering from serious gastric disease can not intake of purine, purine can accelerate gastric secretion, and dietary fiber in the natto will cause mechanical damage to the gastric mucosa, so that the condition is more deteriorated. So patients with acute gastritis and peptic ulcer and other gastric diseases should avoid eating natto.

2. Kidney disease

Natto contains a large number of amino acids, but at the same time the content of non-essential amino acids is also very high, which will aggravate the burden on the kidneys, affecting the normal operation of renal function, and causing obstacles to the patient's recovery. Therefore, for patients suffering from nephritis and renal failure, they cannot eat natto.

3. Gout

Most gout patients are due to purine metabolism malfunction, and natto contains a large number of purine, eating will make the metabolism function more deterioration, so for the gout patients of the crowd, eating natto is the same as adding oil to the fire.