@gezzy,
NOBODY should eat snails in any form. A friend who is a sort of an expert in parasitology informs me that snails are about 99.999% parasites by weight and volume and there's no way in the world to cook them enough that anybody should want to eat them.
Green veggies cannot possibly be a natural food for humans. You do not need to believe in evolution (I don't) to comprehend that Elaine Morgan is almost certainly correct in thinking that humans originally lived in water; that says that the original human diet would have been some combination of shellfish and fruit. Anything else is an acquired taste and when something tastes as bad as greens do, your body is trying to tell you something and you should listen.
The whole world understands that a little kid's normal reaction to alcohol and tobacco is correct, why would anybody think that same little kid's reaction to green veggies might be wrong?