Lifes Like That

My son is almost seven but is about the size of a five year old.  His size doesn’t slow him down any and most times being so small doesn’t bother him.  But it bothers me because I am constatly worrying if he is healthy enough.  I think some of this problem may be due to the fact that he will eat almost nothing.  I have never seen a picky eater who is as bad as him.  When I voiced my concerns to my doctor he told me not to worry about and feed my son the food that he will eat.  If that means he eats fruit loops every day, all day then so be it.  He claims that at least he’s eating.  So, because he won’t eat hardly anything, right now he is pretty much living on fruit loops and cheese slices.

Has anybody here gone through this before?  And if you did, did you ever get your child to eat more different types of foods ever??