Tofu is rich in nutrition, containing many essential trace elements such as iron, calcium, phosphorus and magnesium, as well as sugar, vegetable oil and rich high-quality protein, and is known as "vegetable meat". The digestion and absorption rate of tofu is above 95%. Two small pieces of tofu can meet a person's daily calcium requirement. Tofu is a nourishing, heat-clearing and health-preserving food. Regular eating can tonify the middle energizer, clear away heat and moisten dryness, promote fluid production to quench thirst and clear the stomach. It is more suitable for people with heat constitution, bad breath, thirst, indigestion and fever. Modern medicine has proved that tofu not only has the function of increasing nutrition, helping digestion and stimulating appetite, but also is beneficial to the growth and development of teeth and bones, and can increase the iron content in blood in hematopoietic function; Tofu contains no cholesterol, and is a medicinal food for patients with hypertension, hyperlipidemia, hypercholesterolemia, arteriosclerosis and coronary heart disease. Supplementing nutrition for children, patients and the elderly is also a good diet therapy. Tofu is rich in phytoestrogens and has a good effect on the prevention and treatment of osteoporosis. It also has the function of inhibiting breast cancer, prostate cancer and hematological tumor diseases. Sterol and stigmasterol in tofu are both effective components in inhibiting cancer. Problem 1: Causes indigestion: Tofu is rich in protein. Eating too much at a time not only hinders the absorption of iron, but also easily leads to protein's indigestion, abdominal distension, diarrhea and other uncomfortable symptoms. Question 2: Promoting the decline of renal function: Under normal circumstances, protein, a plant that people eat in the body, undergoes metabolic changes and 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 people don't pay attention to diet, eat a lot of tofu and take in too much plant protein, it will inevitably increase the nitrogen-containing waste produced in the body, increase the burden on the kidneys, and further reduce the renal function, which is not conducive to health. Question 3: Promote the formation of arteriosclerosis: American medical experts point out that soy products are rich in methionine, which can be converted into cysteine under the action of enzymes. Cysteine can damage endothelial cells of arterial wall, and it is easy to deposit cholesterol and triglyceride on arterial wall, thus promoting the formation of arteriosclerosis. Question 4: Lead to iodine deficiency: Soybeans that make tofu contain a substance called saponin, which can not only prevent atherosclerosis, but also promote the excretion of iodine in the human body. Long-term excessive consumption of tofu can easily lead to iodine deficiency, leading to iodine deficiency disorders. Question 5: Promote gout attack: Patients with gout whose tofu contains more purines, whose purine metabolism is abnormal, and whose blood uric acid concentration is increased are prone to gout attack, especially those with gout should eat less. It can be seen that tofu is good, but it can't be eaten every day, and it can't be overdone at one time. The elderly and patients with kidney disease, iron deficiency anemia, gout and arteriosclerosis should control their diet. Traditional Chinese medicine believes that people with cold tofu and stomach, people who are prone to diarrhea, abdominal distension, spleen deficiency and kidney deficiency and frequent nocturnal emission should not eat more.