Apple seeds (and the seeds of related plants, such as pears and cherries) contain amygdalin, a cyanogenic glycoside composed of cyanide and sugar. When metabolized in the digestive system, this chemical degrades into highly poisonous hydrogen cyanide (HCN). A lethal dose of HCN can kill within minutes.
Is it OK to eat apple seeds?
Eating a few apple seeds is safe. However, eating or drinking large quantities of ground or crushed seeds could be fatal. According to a 2015 review, the amygdalin content in 1 gram of apple seeds ranges from 1–4 milligrams (mg), depending on the variety of apple.
Why do apple seeds have cyanide?
If the seed is chewed or otherwise broken, human or animal enzymes come into contact with the amygdalin and effectively cut off the sugar part of the molecule. The remainder can then decompose to produce the poisonous gas hydrogen cyanide.
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