Folklore: Eating the famous Thai dish "Lemon Shrimp" will lead to poisoning, because vitamin C in lemon will turn the gold pentavalent arsenic contained in shrimp into toxic trivalent arsenic, which is commonly used to poison people in China costume dramas.
The fact is that this kind of violent chemical reaction can only happen in the laboratory. Except shrimp, crab, lobster and shellfish (clams, oysters, etc. ) all contain arsenic. Theoretically, high doses of vitamin C and pentavalent arsenic can indeed be converted into toxic trivalent arsenic by chemical catalysis. However, in our general diet, it is impossible to eat a very large amount of shrimp at a time and add a lemon at most to taste, so the content of vitamin C cannot be too high. If we want to eat a plate of lemon shrimp, it may lead to.
At present, there is not enough evidence to prove the redox effect of vitamin C on arsenic. In addition, studies show that organisms have the ability to convert arsenic into low-toxic organic arsenic, and store and metabolize it; If you are really cautious and want to avoid excessive intake of heavy metals, you can choose to discard the shrimp head. Studies have shown that the reduction of arsenic content in blood of long-term hemodialysis patients may be related to the disorder of central nervous system or the high incidence of vascular diseases. So don't be fooled by these "pseudosciences" and affect a better life.