I'm a fussy eater.
And I am...allergic? Intolerant? Irritated? ..to various fruits - apples (though less so recently), plums, peaches, figs, and underripe tomatoes.
I used to be VERY fussy when I was a child and it wasn't because I'd been pandered to or because I was trying to draw attention to myself in any way - quite the reverse. My parents ate/eat everything there is, I had plenty of opportunity to try things, I don't recall a big deal being made over me eating/not eating things.
I just couldn't put some things in my mouth - more often than not it's texture-related (I can't bear mushrooms, for instance), but I also have a v highly-developed sense of smell (I can taste melon if somebody opposite me eats it, for instance), so some foods are too strong for me to consider putting anywhere near my mouth - stinky cheese, some fish, etc.
DS1 is v similar to me, despite me being ultra-laid back about food with him, he had ample opportunity to try all sorts of things from the moment he was weaned but he often wouldn't touch things that were "clammy" - like most fruit and raw veg. He's always been a v tidy eater and doesn't like getting his hands messy (same as me - no fingerpainting for me!), so I think it's a texture thing with him too. He won't eat anything in breadcrumbs, for instance.
DS2 on the other hand - weaned the same way, will eat pretty much anything in copious amounts and gets stuck in with both hands.
So for those of you who have one child who either eats everything or is fussy, a lot of it will be nature, I think.
And for those of you who take full credit for your child eating everything - you're deluded and unnecessarily smug and I wish you a fussy eater next time