That, and the American lifestyle leads to inactivity. Air conditioning is everywhere, so there is no "penalty" for being fat and uncomfortable in the heat. And I suspect that a good portion of the population doesn't walk even 100 meters per day. Maybe 5 meters to their car; 10 meters from the car to the workplace, reverse all that; and include 10-15 meters per day from the kitchen to the lounger/sofa in front of the TV. The "workout" comes once per week when they go to Walmart to shop for groceries. (I know this sounds exaggerated, but is it really?)