Well I used to eat fast food everyday, if you consider Quizno's as such. I also ate McDonald's, pizza from time to time as well. That was when I didn't care about how much money I spent. Nowadays, I have stopped eating out. When I ate McDonald's for a few days in a row, I did notice my stomach getting a bit bigger. This is to be expected when you consider the fried chicken sandwiches, mayo and other things they put on them. Plus fries. And when you add on the coke, you're talking about lots of calories. Back when I ate lots of this type of food, I did not exercise so I don't know how this would affect your working out routine. Now I don't eat fast food and I do workout. I agree with the people that say that anything in excess is bad and fast food in moderation is not all that bad. If you eat fast food a few days a week, then you should be ok depending on your health. But if you eat it everyday, then you better do something to offset all those fried calories. Of course, I'm no physician so I can't verify what I just said.