My son doesn't like to eat what we eat!!?

My son is 6 yrs old, and once upon a time, he used to love eating everything except for broccoli, and now, it's seems to be everything except for kd and chicken noodle soup, and one great food, hot cereal. I've tried every which way to help him with rewards, talking to him nicely, etc etc.. does anyone have any methods of trying to entice their children to eat the goodstuff??