MunchMummy my dd is the same, and has just turned 4. I take comfort from the fact that she has tried some new things in the past few months, like cashew nuts, custard, cheese. Hmm perhaps she likes foods starting with c?!
She doesn't eat any of those 'new' foods with regularity though. If she was hungry and was given a bowl of custard with apple pie, and knew nothing else was forthcoming, she would have some.
We did try and force the issue, we did a star chart, bought some toys and treats for the star chart, and served her unfamiliar food for every meal. Often if she refused it, the same thing would be made afresh for her next meal.
Well she ate very little several days. She got one star on her chart for trying celery - fucking celery, not the protein and carb filled new food I had hoped she would eat. She cried. She was hungry. It went against every instinct I have. Then I noticed she had a little temperature and seemed unwell, so we called the whole thing off. Towards the end of the evening we twigged that she had Norovirus, which I quickly came down with too.
I regret trying to 'force' her. If I offer her new foods now, I do it one new food out of say 3 / 4 foods on her plate, and I have to reassure her that I won't force her and that it is her choice, but she can't have her doughnut unless she tries a bit of pasta. She refuses, eats all her normal foods, and gets her doughnut after her next meal.
At least we know where we all stand!
I am just glad that she doesn't appear to be phobic about any foods, she does not feel that she has a 'problem' with food and as much as it worries me sometimes that her diet is too restricted, I remind myself that it is her choice and that a great many other children her age are just the same.
As long as she is getting a decent range of carbs, protein, bit of dairy, cereal, and fruit and veg (and she is big on fruit and veg it's the rest she struggles with!) and seems full of energy and has a good appetite, I am okay honest even though she is a bit on the skinny side for a kid her age, mind you she is a bit tall for her age too and had always been long and lean.
In short, I think she'll grow out of it.
Disclaimer: when I say 'force' I mean saying 'this is what is for lunch' and that's it, no alternatives.