My niece has lived on bread and butter for the most part of her short life, maybe I can offer possible insight?? She doesn't 'like' flavour, or mixtures of it. It's something to do with sensory over stimulation the dr said. Getting her to eat ANYTHING flavoured or colourful has been a chore! She's only 10, but there has been noticeable progress We have slowly upgraded her to cheese. So now she'll eat a McDonalds cheeseburger (no sauce or garnish) Mac n Cheese, toasted cheese sandwiches and only Marguerita pizza. She only eats plain ice-cream, and oatmeal biscuits, and half a banana. Oh and fries and chicken are safe too. Sometimes she'll try some chocolate... This has been a long process, she's been 'picky' since she was a toddler. She will willingly go to bed hungry if the food looks too 'strange' and her mum hasn't prepared something seperate for her. What I've noticed is, since there's a level of trust built up between her and a few of us, with the right words and coaxing, she'll begrudgingly atleast TRY a bite of something new, and that's how we've expanded her menu... And yes, in the past, she has been known to go into a panic over being expected to eat something she couldn't comprehend eating. Now that she knows we're trying to help, the worst she does is sulk.