“Spit out your cherry seeds because they contain the poisonous compound hydrogen cyanide,” Dr. Kantor said.
That goes for other stone fruits like peaches, plums, and apricots. But don’t worry about it too much. Hydrogen cyanide is a poison, yes, but you’d have to eat a ton of cherry seeds before it would kill you. The limit for a 150-pound human is 703 milligrams of hydrogen cyanide per day, according to the National Institute of Health, which is safely hundreds of cherry seeds.
There’s a good reason why fugu (or pufferfish) is banned in the United States: it’s one of the most poisonous foods in the world. Unless it’s cooked exactly right, the puffer fish is 1,200 times more deadly than cyanide, which makes those cherry pits looks like a walk in the park.
Casu Marzu: Sardinian Maggot Cheese
Casu Marzu is a traditional Sardinian cheese that’s extra-fermented by live maggots that partially decompose the cheese. Not feeling this one? Neither is the US government. The cheese is banned for sanitary/hygienic reasons.