We don’t eat apple seeds or peach seeds (although they look like almonds). Someone said they have cyanide in them. Actually, it’s amygdalin, which converts in the body to hydrogen cyanide. However, unless you eat a whole bunch of them, whatever’s in an apple or a peach isn’t enough to hurt you, and they do contain healthful vitamins and antioxidants. Someone said they can cure cancer but that’s not well attested. The real problem is they taste bitter and not sweet.