Because there's all this stuff about never forcing DC to eat because it will make them obese or anorexic or whatever, and yet there are times when you know that the food is being refused because the DC want to go and watch telly or play or they just feel like acting up - or they want something other than the meal that's on offer.
DSis generally a good eater but now and again he starts playing up: I turn the telly off and tell him he's got to eat 3 bites, then coax a little more - usually he will then clear most of his plate. I don't allow him to refuse one meal in favour of another ie if he doesn;t like his dinner he goes without till the next meal. What does everyone else do?