There is a condition called syndrome of expertise in food, in which children consume no more than a couple of foods chosen by them capriciously, chocolate and green gnocchi or certain brands of potato chips and vanilla yogurt.
Eating behavior is usually associated with social behavior: a child who chooses to consume certain foods also prefers a couple relationships which are very symbiotic, that is, it is difficult to make relationships with others of their generation.
These children often have parents “specialists” to perfect what kids want instead to specialize in that warn children to learn new things.
What you should do is change their goal of education. Explain that eating potato chips and skim milk are not fed properly. Initially it may be rejected, but the flavors will be changing and incorporating new foods slowly.
The difference between specialize in the child’s wishes makes the fragile child is a child unable to fight this, help him adapt to life, can develop tools for better competition.
Many parents who feel a sense of pride in knowing what their children want, and it is not meeting the child, but to adapt and provide the tools to live in society. It is easier to prevent infant in the garden when the child is in fourth grade, when the child has formed a social concept.