Why is obesity becoming so common?

Lifestyle.: First, technology has made most of us quite sedentary, and as such we don't expend nearly as many calories as we used to. Second, busy lifestyles tend to beget grab-and-go types of foods, which are generally less healthy and actual relaxed sit-down meals. That's one way to see it.

Obesity: If you look at obesity from a historical perspective there is a relation between sugar consumption and increased obesity.