The One and Only PoldaranI vaguely remember a guy eating a junk food diet(part of me thinks it was a professor) to prove that calories in-out is what matters most for weight loss. [link=http://en.wikipedia.org/wiki/Fat_Head wrote:
And there was a documentary done in response to Supersize Me in which the guy ate a fast food only diet and lost some weight.[/link] It was actually pretty interesting to watch.
It was a guy who derived all his calories from eating Twinkies. I remember that experiment and while it was entertaining, calories in - calories out isn't the whole story. There is a concept called Metabolic Advantage that is associated with folks living paleo or otherwise low-carb lifestyles in which the theory is that calorie burning is more efficient.
As far as that super-size me documentary, I remember watching it and thinking the guy was an absolute nut job. The sheer amount of food he was trying to eat in a sitting would make anyone his body weight throw up. I know what he was trying to prove, but it wasn't the food alone that made him the way he was at the end of that experiment. He was definitely less healthy than he was before he started, but anyone who followed his ridiculous menu of way too much sugar would have the same result. He'd have a coke, and then a milkshake, and a couple burgers, and fries... At one point the spread in front of him just looked like a feast for a family of four. He still hasn't posted the detailed food logs - all we know for sure is that he only actually supersized 9 total times.
A better experiment would have been to have three single supersized meals per day and see what the results were from that, but he wanted to push 5k+ calories per day no matter what so he ordered what he wanted off the menu. So in the end, he proved that yes, eating 5k+ calories a day with little to no exercise can result in weight gain.
So glad he was able to clear that up for us.