The amount of food I see people eating at work is just mind-blowing. I batch cook most Sundays - nothing special or particularly healthy, just stuff like veggie pasta bake or sweet potato chili with rice, and I see people in the office microwaving similar food at lunch - but they're eating the amount I make for 5 meals over the week in one go! The guy sitting next to me will bring in 4 entire ham sandwiches and eat them at noon - AFTER having a sausage butty at 10am.
No one I've noticed ploughing through this food is obese, no more than I am, so maybe they don't eat much at home? If I ate those portions I'd be sick but if I got used to it I'd be the size of a house in no time.
Interestingly, I rarely see the people at work who ARE obese eating much of anything, which is odd.