My family hail from a poor village in Jamaica and food fussiness is unheard of because children eat what they are given because so many of them may still only have one or two meals a day. That is also the experience of my friends from other developing nations
This food fussiness malarky appears to me to be unique to the developed countries because children have lots of choices plus many of them tend to snack between meals.
My mother, who grew up in Jamaica as one of 10 children with a widowed mother and no social security network and would often only have water to drink as an evening meal cannot comprehend this phenomenon either.
I bet if a lot of the fussy children (I'm referring to those without medical issues) had to regularly go without food like millions of children in the underdeveloped world do so every day, they would soon eat what they were given imo.
Harsh but true.