M.J.
Our son has food neophobia -- a genuine fear of food beyond picky eating -- and we recently discovered Centrum makes a fruit & veggie vitamin. We make sure he gets one every day (two is the adult dosage), so he has at least one serving in his body that way. Beats going without.
You could put "offensive" foods in front of our son 1,000 times, he won't eat them. Try to disguise them in any way, he figures it out immediately. We put our foot down once and he didn't eat for two days. Not all kids are easy fixes, contrary to popular belief. Even a therapist couldn't improve our son's eating.