Why Americans Are Fat

Great article:
Why Americans Are Fat

First paragraph teaser
"One of the most peculiar findings in obesity research is that exercise — even if vigorous and regular — doesn't reliably lead to weight loss. The reason, as I wrote last year, has to do less with physiology than psychology: people who exercise tend to reward themselves with desserts and snacks that they would never consume otherwise. Exercise helps you stay fit, but it also makes you hungry, so it usually doesn't turn fat people into thin people. Call it the paradox of the gym."