We have had issues since DD was tiny - ended up referred to the Evelina in London when she was 2.5 over it as she would not eat at all and was B12 deficient and iron deficient.
They tried giving me vitamin powders 'to add to her food'... I had to explain that this was part of why we were there, there was not really any food to add things to!
They did advise me that ketchup is definitely a vegetable, and to feed her high calorie stuff as much as possible - if all she wanted was crisps and chocolate biscuits then at least she was putting something in her mouth and swallowing it!
They also told me not to stop breastfeeding - I reckoned I was going to end up in documentaries, but she finally gave up at 3.5 years.
She has bloods checked relatively regularly and is surprisingly healthy given her diet.
@FairyTaleOfDudley oh god, the trauma over new things drives me insane. And even if I get her to try something and she decides she likes it, it will still be rejected if I propose it for a meal in the future. I now cook for DH and myself, she can have what we are having - or cook for herself, but I am not running a restaurant!