G.S.
Dearest S. -
Children copy what they see. If you and the other adults in his life are eating fruits and vegetables, he will also.
Have lots of fresh fruits and veggies cut up in spears or bite-size pieces to offer through the day. Most children prefer raw to cooked.
Angie has some great ideas for combinations that most kids enjoy. Make sure he sees you enjoying these things.
Don't make a big issue at mealtimes, but limit other choices. Don't feel you have to give in and make him a peanut butter sandwich or whatever it is he is demanding. Just tell him that what is on his plate is what there is to eat. No child ever starved on purpose! He will soon learn that the way to keep from being hungry is by eating the good food Mama gives him.
Don't let the idea that you are making him unhappy cause you to back down. You are the parent and you know what is best for a growing boy.
Keep up the good work. I know you are a loving mother.