Soybean, which makes tofu, contains a substance called saponin, which can prevent atherosclerosis, but it can also promote the excretion of iodine in human body. Eating too much tofu for a long time can easily lead to iodine deficiency and iodine deficiency disease.

Tofu is rich in protein. Eating too much at one time will not only hinder the absorption of iron by human body, but also easily lead to protein's indigestion, swelling, diarrhea and other discomfort symptoms.

Under normal circumstances, protein, a plant that people eat in the body, undergoes metabolic changes, and finally most of it becomes nitrogen-containing waste, which is excreted by the kidneys. When people get old, the ability of the kidneys to excrete waste decreases. At this time, if you don't pay attention to diet, eat a lot of tofu and take in too much protein, it will inevitably increase the nitrogen-containing waste generated in the body, increase the burden on the kidneys, and further decline the renal function, which is not conducive to your health.

Tofu contains a lot of purines, and patients with gout with abnormal purine metabolism and patients with increased blood uric acid concentration should be careful to eat it.

Tofu is cold, the stomach is cold, people with spleen deficiency who are prone to diarrhea and abdominal distension, or people with kidney deficiency who often have nocturnal emission should not eat more.