The finest delicacy in Japanese cuisine is fugu fish. However, if improperly prepared, eating this fish can cause fatal poisoning. Scientists have found out that the poisonousness of fish fugu is due not to innate properties, but exclusively to its diet - sea stars and shells, from which it receives poison.
If you feed it with non-toxic food, there will be no lethal poison in it. However, this discovery did not arouse the joy of the chefs and owners of Japanese restaurants. After all, a portion of fugu is very expensive and attracts tourists with the opportunity to experience acute sensations, and the absence of danger can significantly reduce the price of a dish.