Someone who monitors/watches the amount of food you eat .
Liz: *buys pizza and wings for friends* "We can at least get 3 slices"
Peter: *Eats 4 slices of pizza*
Cameron: *Watches friends eat* "Liz said 3 slices of pizza"
Peter: *Laughs* "Liz says, a lot of things"
Cameron: *fights over pizza*
Liz: "Why are you guys fighting for pizza, when we have 50 wings to eat" *gives Cameron the food stickler her slice of pizza*