The amount of gypsum placed in the tofu with gypsum points is very small, usually about 3. Gypsum is actually calcium carbonate. The gypsum used to make tofu is of food grade and is a food additive, but brine is not. I only know that tofu is a good thing, and you can eat tofu regularly, but not too much. Eating gypsum tofu can supplement calcium. The harm to the body is negligible. But you can’t eat large amounts for a long time.

There is also a kind of brine tofu. The tofu currently on the market claiming to be brine tofu is basically fake. The output of brine tofu is very low, and few of the most popular ones actually use brine to order tofu. In some places, brine tofu is also called pot-roasted tofu. This is questionable because there are additives currently on the market that add to the tofu and smell like pot-roasted tofu, and the smell is relatively strong.

Gypsum (currently only plaster of paris, i.e. calcium sulfate hemihydrate) is a food additive regulated by our country (a small amount of edible food additives must be non-toxic and harmless. For details, please refer to the definition of "food additive"), so in The current level of science and technology considers it harmless to eat food-grade gypsum. 2. The current statement on the Internet that gypsum is toxic is not rigorous. These remarks confuse industrial gypsum and edible gypsum, and their errors are completely similar to the conclusion that alcohol is toxic from industrial ethanol. After all, ordinary industrial supplies do not have high requirements for the purity of raw materials, but as food, we have very high requirements for its purity.

3. I personally think that another explanation on the toxicity mechanism of gypsum on the Internet is also wrong. The explanation states that gypsum cannot be broken down by the body after being eaten, and there is a risk of causing stones. Let me explain a few points here. First of all, the components of gypsum (calcium ions and sulfate ions) do exist and are necessary in the human body, so these two ions cannot be said to be toxic to the human body (in moderate amounts, excessive amounts are naturally not allowed, and the same is true for other ions). Secondly, calcium sulfate itself is a slightly soluble solid, not insoluble; not to mention that the acidity of gastric acid (mainly hydrochloric acid) is enough to dissolve calcium sulfate, so it can be broken down into ions by the human digestive system and absorbed.