Hell, I *WAS* a picky eater as a child. And I ate what I was given or I went hungry.

I'll second Conuly's point that most pickiness that I've encountered is a steady state, not an on-again-off-again phenomenon. I'd also expect a mature adult to be able to discuss tomorrow's menu in a reasonable manner, no matter how picky they are. (Children get less leeway, but there's still a little room for discussion.)