There's only one thing that I simply can't eat, and that's brokkoli - and its about the texture, not the taste. I can eat the stems, but when the head breaks into a million tiny pieces - yuk. Its a horrible feeling.
Apart from that I'm willing to try just about anything at least once, unless its something I have a moral problem with, like sharkfin soup (did you know that there are 73 million sharks killed every year? How long can that last?), birds-nest soup, etc, and things like foie gras that require the animal to suffer for it. I also prefer to stay away from endangered fish.
Right, if anyone wants me, I'll be outside, hugging a tree...
PS: Ofcourse there are several things that would cause me to die AFTER I ate it, but I didn't think they fit the question