If you're constantly hungry at that much, you're eating the wrong foods.  And they almost always are. It's one of the most frustrating things about this subject. They inevitably lie about what they're eating and make whining pleas that they just want to eat an occasional hamburger or something. But assuming they don't pile empty calories on it, a humburger is fine. A hotdog is fine. And it goes on and on. But in reality they are piling empty calories on those things when they eat them. And even that's not usually the crux of the problem. The main issue is that like giant children they want to live on soda and potato chips. I'm fairly sure I'd constantly be hungry too if I was stupid enough to try living on 1800 calories of soda and chips. Or twinkies, pixie sticks, or other things that pretty much just dissolve the second they hit the stomach. Their complete and utter stupidity about anything food related is just amazing. The only thing more amazing is how many of them won't call each other out on it.