In fact, oranges can't be eaten with seafood because seafood contains a certain amount of pentavalent arsenic, while fruits such as oranges contain vitamin C. Theoretically, if vitamin C and pentavalent arsenic are chemically catalyzed in a laboratory environment, it is possible to convert previously nontoxic pentavalent arsenic into trivalent arsenic, also known as arsenic. However, it should be noted that this reaction is actually only a theoretically realizable reaction, which can only be realized under very harsh conditions in the experiment and cannot happen in our life.

Moreover, from the dose point of view, according to the calculation that each kilogram of shrimp and crab contains at most 0.5 mg of inorganic arsenic, if all these arsenic elements are reduced to arsenic by vitamin C, theoretically, it is necessary to eat more than 100 kg of shrimp and crab at one time to cause arsenic poisoning. It is generally impossible for normal people to meet this condition, so it is impossible to do it.