My great-grandson, age 6 years will eat only a limited kinds of foods--apples, oranges, cottage cheese, french fries, chicken nuggets, milk, corn, only one kind of take-out pizza. He's labeled "picky eater". My concern is that he does not get sufficient nutrition from limited varities of food; he goes without eating rather than to even try any other foods. Parents divorced several years ago; refuse to see anything other than stubbornness, Can you help?