The Modern Forager (a very nice blog) points to an interview with Gary Taubes.
Taubes is the controversial science journalist who is getting people to think about low carb diets again with his book Good Calories Bad Calories. (I've read it, it is great.)
His recent article Does Exercise Really Make us Thinner? is pretty thought provoking too.
This book by the way is being sold as "The Diet Delusion" in the UK for some reason.