My son has been a faddy eater since he was a toddler too, at it's worst when he was around 3yrs old eating just one of four food items.
he is much better these days aged 6 although i still wish he had a bit more variety.
I can understand how you feel .my son just never has had an appetite ,and has not been interested in food (and very reluctant to have anything new and can even refuse things he previously liked if he hadn't had it for a while) and so i felt like i had to monitor everything he ate to ensure he was actually having enough to survive on because he didn't have the usual appetite to do it for him.
I've learnt not to make an issue of it . Time in the kitchen can be a really good thing ,looking through a recipe book together first to both choose what to make and also letting them have some input at the supermarket can help too.
i used to try and buy things with a food theme.ie games,books,films just to try and raise an interest in the subject which i think has helped too.



