Anybody that checks up on you eating or about to eat food.
Person 1: Man, I would so want that cake.
Food Police: Not so fast, your no eating that cake you fatso.
Person 1: Damn Food Police!
Worthless idiots who can't understand the fact that people need to fuel their bodies to stay alive, and thus feel motivated to make asinine comments whenever they see someone eating.
Food Police: OMG you guys are eating THAT?
Normal Person 1: Yes, we're eating dinner. Holy crap, alert the media.
Normal Person 2: *snickers*
Food Police: But don't you know that -
Normal Person 2: What, that people have the right to eat the foods they like, in order to fuel their bodies? We sure do!
Normal Person 1: Exactly. Seems like you're the only one here that's confused.
Food Police: <staggers away, looking absolutely horrified>