I basically lived on the McDonalds value menu for about six months. Between transit and work I didn't have much time to do otherwise, and it was cheap, passable calories. I didn't even think of it as food, just fuel to get me through the day. Didn't get fat. Probably because I took two seconds to see how many calories I'd be consuming and just got enough for the day. Throw in a vitamin and drink water all day and I never had any issues. But, the usual crowd I'd see there every day were putting down 1200 calories for breakfast alone, washing it down with 20oz of soda, then going on to talk about what they wanted to have for lunch/dinner. Like... that's just what there was to talk about. The next meal. It was so weird to see, knowing that was just the first meal of their day.