My son is 16 and was diagnosed with Aspergers Syndrome when he was in the 3rd grade. We have struggled with getting him to try foods all along. He won't eat anything he considers to be a messy food, such as pizza because of the tomato sauce, mac & cheese, etc. If he has tasted something before he and didn't like it he refuses to try again. My 13 year old daughter is also a picky eater, we believe it's because she sees her brother being picky so she picked up his habits. Although she does eat some things that he won't she still has her moments. We have been told to keep trying and to encourage them to try new foods, which we always do. It's difficult but keep on trying.