In our home food on the floor doesn't last long. But it's not the children who get to it. It's either one of the cats or the dog, if he's inside with us at the moment.
If, by chance, one of the animals HASN'T messed with it ... and one of the girls quickly picks it up and eats it, I don't say anything. What can you say really? It's not really going to hurt them.
If the animals haven't gotten it and the girls haven't gotten it, I usually toss it out to the dog or call one of the cats over lol