Denial levels are pretty high right there, indeed. I bet if someone were able to covertly observe and record their food consumption for a week or two, it would shed some light on the situation.
Now, I am only 23, and as such my metabolism is still fairly quick - but I am a lazy bum. I have an office job, and spend far too much time at work and at home at a computer desk. I still eat plenty, but I am not yet over 180 pounds. I was for a whle in 2006, after all those ice cream 'thick-shakes' I had each and every day on my Australia holiday.
Losing weight is simple. It's not enjoyable, sure, but it really is very, very, VERY simple. As Hawkmoon said, you just reduce caloric intake, and if possible, increase your levels of activity.