Don't put onions when making tofu. Some people often put onions when making tofu, which is actually unscientific. Tofu contains calcium and onion contains oxalic acid. Oxalic acid is easily mixed with calcium to produce calcium oxalate. This kind of calcium oxalate is not easily absorbed by human body, thus destroying the nutritional function of tofu to human body. Therefore, it is not advisable to put onions in tofu to avoid destroying its nutrients. Tofu is sweet and cold, non-toxic, and it is a kind of health food that can tonify and clear away heat. 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 suitable for people with heat constitution, bad breath, thirst and unclear stomach.

Yan tofu can increase the iron content in blood in hematopoietic function, and the phytoestrogen flavonoids contained in it can fade spots and improve menopausal syndrome, so for female friends, eating tofu has a good effect of enriching blood and caring skin. The nutrients in the strong bone tofu are comprehensive, and the absorption rate is as high as 95%. Two small pieces of tofu can meet a person's daily calcium requirement.

Tofu contains the "sour angle" of calcium in fruit, which is beneficial to the growth and development of teeth and bones. Daidzein can also effectively prevent osteoporosis. Brain-nourishing tofu contains soybean lecithin and rich high-quality protein, which is beneficial to the growth and development of nerves, blood vessels and brain, and can enhance immunity and keep fit.

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 biological value of soybean protein is comparable to that of fish, and it is a leader among plant proteins. Soybean protein belongs to complete protein, and its amino acid composition is good, which contains almost all amino acids necessary for human body. Soybean used to make tofu has an oil content of about 18%, and most of it can be transferred to tofu. Soybean oil has a large proportion of linoleic acid and contains no cholesterol, which is beneficial to the growth and development of human nerves, blood vessels and brain.