DD eats generally healthy but I admit to giving her a biscuit when she is nagging at me because she is hungry. She signs when she is hungry which is uber cute! lol
I would rather she eat healthy obviously but I have moments when I don't eat that great. In saying that at 14mths she has never had lollies, or fizzy which she doesn't need and has had a couple of bites of a cheeseburger and chips rarely! In laws tried feeding her taro

and chips and she wouldn't eat them she preferred the dry kruskit

I don't eat cereal so not much of a chance of her having anything other then weet bix toast or cornflakes as thats what I would buy for her. I used to buy the fruit weetbix for DP so she would probably have that for a treat lol. No chance is she getting coco pops or anything like that! Especially while she's still in nappies I don't fancy changing a glow in the dark nappy lol.
As for the original question. I guess I would rather them eat something and go to school with a full tummy then go hungry. I don't think its fair making a child go without food, I know I can go a day without food but I don't think its fair on a child who can't do it for themselves. I would be questioning though if a child was consistently going to school with rubbish in their lunchbox AND eating an unhealthy bfast and probably dirty bird for dinner YUK!