Son B was very picky as a kid--he ate basically meat and starch, preferably potatoes. And the meat couldn't be pork, unless it was bacon or ham. No fish or seafood. No spicy food. Corn was his only vegetable.

Now, at 23, in his travels, he eats almost everything he encounters, including duck's blood soup, eel (which I won't), and unidentifiable stuff sold by Vietnamese street vendors.

It can happen.

I'm sure some kids learn to eat a wider variety by being forced to try everything, but we learned early on with him that "forcing" anything didn't work (we'd have had to escalate into illegal territory!). He had to develop at his own pace, in everything. And so he did.