The best book you can read challenging the received wisdom that obesity is problem of overeating and inactivity.
In Taubes' view, obesity is caused exclusively by the proportion of calories we consume. Contrary to most diet and nutrition advice of the last half of the 20th century, Taubes argues calories from fat and protein are good, but the calories from carbohydrates are responsible for America's ample stores of body fat and its attendant health problems. Exercise, whatever its broader benefit, is irrelevant for weight loss since it stokes the appetite.
This argument is slowing finding cachet, thanks to sugar (or really high fructose corn syrup) becoming the current obesity bugbear. Every food commercial now casts protein as the star. The fear of fat is also receding, though I still often can't find full-fat yogurt in the grocery store amongst all the low-fat added-sugar varieties.
Pity me as I wander the dairy aisle, hoping Taubes views to catch on sooner rather than later.