One thing I don't have to worry about with Flash is his eating habits. He'll eat almost anything that isn't nailed down... and some things that are.
My big problem is variety of greens available at the local stores. I end up giving him the same few all the time - parsley, cilantro, and carrots are staples that he always gets, then I also sometimes give him kale, collard greens, spinach, romaine, endive, and celery depending on what's available in the store. Romaine and celery become my fall backs when the others aren't available, though they aren't Flash's favorites, so I try to get him other stuff instead. Actually, celery's the one thing he's ever left all night in his salad bowl without eating.