ok i'm going to give you my opinion as an adult who was a very fussy eater as a child (diet consisted of cereal, toast, sausages and chocolate- and that's it)
first of all i would like to tell you that while i am by no means the most varied eater now, i will try almost any dish you set infront of me. so there is hope.
but if i could advise my parents what would have helped me when i was 6 i would tell them to please stop pointing it out, to me, to family, to visitors, to teachers. stop taking me to the doctor and making me feel like a freak. stop making it into such a big issue that even though the food on your plate looks and smells really good, i cant now tell you i want some because you will make such a big celebration about it and i just cant take the attention. please just make dinner and set it in front of me and make no comment or sidewards glances when you see me looking at the chicken out of the corner of my eye. please dont faint (mum) if i touch it with my fork and dont ring the newspaper if i taste it. now none of these things actually happened but when all your life you have been told you are a fussy eater and that it causes your mother so much worry, you really dont know what the reaction will be when you do try something you haven't previously eaten. and please please dont label me as fussy. i know that's what i am but the label makes it harder for me not to be even though it's what i want. if i could ask anything of my parents i would ask that they forget everything they know about what i will and wont eat. just treat me like a normal member of the family. make dinner for me the same as everyone else and if i dont eat it all please dont get frustrated and angry, just let me thank you for the dinner and clear my plate away at the end. if the dinner consists entirely of food i dont like then i will be hungry but please allow me to have toast or fruit before bed.
i started eating a more varied diet when i moved out of my parents' house aged 19. there was no audience, no issue, no build up or let down. if i fancied something i tried it, if i didn't like it, no-one was disappointed with me.
i know this advice might be hard to agree with as there are some people who very much insist on children clearing their plates or eating 6 forkfulls etc. but believe me when i tell you that for someone who has the beginnings of a picky appetite, drawing attention to it will make it worse, not better. some children go through fussy stages during toddler hood, i have 2 dcs, 1 did, 1 didn't. it is normal, the less issue you make of it at the time (just accept it, knowing it will pass) the less issue it will become for your child. dont create a child that ends up as an adult with massive food issues even going as far as seeing a hypnotherapist that wont work.
as i said, i dont eat everything (i dont know anybody who likes all food) but what i eat now would be considered a normal diet. my mother never thought she would see the day i tucked into a bowl of pasta or even fish and chips. i still have issues and i know i didn't create them but they exist now and i have to just work with them to have as normal a life as possible and be a good influence for my own dcs. my own 'fussy' ( i dont use that label, it;s just for the purpose of this thread) eater gets made exactly the same meals as my other son, we dont have uncomfortable meal times or tears over his plate. he eats what he wants and there is no comment made. he always has free access to fruit, he can have cereal or toast if he wants after dinner and sometimes he does, i dont mind at all. he is a healthy boy, i'll do all i can to avoid passing on the issues that were given to me.