My ds was the human garbage disposal. He happily ate vegetables (even asking for more servings or them as a snack). Loved quinoa, everything healthy (and junk food too). It made up for him not sleeping the night through until 3.
All of a sudden, broccoli is "gross". Quinoa is "nasty". Tomatoes are off the list. He still is a good eater, but just not as good as before.
I'm getting the feeling that he's getting stuff from preschool. I'm wondering if he will go back to liking these things again.
I also worry a bit that dd will start copying him too.
Re: Suddenly not liking foods
My son is a picky eater too. It seems that the moment he decides he loves something and I buy a lot of it he instantly changes his mind. Then 2 months later he suddenly wants that food item again. I think he will grow out of it.