Oh, I wasn't suggesting we should starve our toddlers to the point of malnourishment to get them to eat their dinner!
But I think there's quite a bit of evidence (I mean proper evidence, not just my experience described below) that young children are reasonably in tune with their own needs.
I'm definitely in the "born" camp and take my hat off to those dealing with fussy eaters - am lucky to have a good eater dd.
But I've noticed that she does go through phases of wanting particular kinds of food (eg meat or greens or starches) and when I notice this, I go along with it as I think it's probably happening for a reason.
There are limits of course - eg I don't regard a need for hot cross buns as a nutritional emergency ..... 