guinesschik's got it.
The sort of crap most people shove into their bodies would make them taste disgusting. I know how I stink after too much coffee, curry or whisky, so heaven knows what I'd taste like (though my fingernails always seem pretty tasteless!).
I think the answer is only to eat vegetarians. Just think of it; by devouring a veggie you're helping save the world from global warming (cf: the farting thread).
On another tack entirely, why can't the GM pioneers, in their infinite wisdom, make peas, beans and sprouts that taste of snot? Not for me, you understand, but it may be the only way to get small children to eat them.