My son will only eat chicken?

i can not get my son to eat very much, he will only eat if it is covered in breadcrumbs - nuggets, fish fingers, fish cake etc, He will not eat anything potato based, no vegatables, no bread(no sandwiches). i can get him to eat dairylea dunkers, some fruit, but he always ill due to lack of vitamins. please help
Update: he is 20 months, he will eat sausage rolls too. is Jamie olivers book that good?
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