An apple a day
An apple a day keeps the doctor away, maybe so, but if you were to eat a cupful of apple seeds then you could be in big trouble and it could be time to call the doctor! You see, the seeds of the apple contain amygdalin, a sugar and cyanide compound called cyanogenic glycoside. Oh, it won’t hurt you in small amounts but in larger amounts (at least a cup full) they could cause adverse reactions. It does, however, take a few hours to work.
This pomaceous fruit (Malus domestica) is part of the rose family and its wild ancestors (Malus sieversii), can still be found in Central Asia.