Stefen, there are many plants(and animals) which produce toxic
substances,which might be thought to be edible, and many sources on the web
can be found which discuss them. I assume, however, you meant plants GRAS
(generaly regarded as safe)which are legal to sell at the market?

Pat

Stefan:
>I don't know of toxic substances in nature. Any substance can be toxic if
>you eat too much of it or your body doesn't want it now. The question for
>me is not which toxic substances could be in the skin of a fruit but if
>I am adapted to digest them.