Limited safe foods

My son is almost 8. He has adhd, epilepsy, APD, dysgraphia, dyslexia and dyscalculia. His neurologist has suggested we don’t seek an ASD diagnosis for him, but it’s very clear he is Autistic (I can explain this point if it’s important).

Anyway, ever since he was young he has had a very limited palate of food. This has only got more difficult since starting Ritalin and increasing his dose. He doesn’t enjoy anything sweet, which is no big deal.

His current safe foods are bread, buns, ketchup, cheese, instant noodles, carrots, celery, cheese burgers, olives, crackers, chicken nuggets. And the list is getting shorter and shorter by the week.

He will tolerate other foods on his plate. But he won’t eat them. We offer other foods, try to put one new food on his plate and make it a game. He doesn’t feel hungry and isn’t that bothered about food.

What have others tried that have helped?