Yeah, but 100 years ago everyone walked several miles a day and nobody sat on their tuchus “surfing” the Internet. This is actually a quite sufficient explanation; if you walk three hours a day and never use a car, bike, computer or TV you’ll be able to eat whatever you want, too.
Obviously for many of us that’s not a sustainable lifestyle, though. We’ve structured our society and infrastructure to require vehicles and sitting down and discourage functional exercise.
Edit: I think Meepster and I both know that fat people did exist 100 years ago, and that not everybody walked everwhere (trains existed, the rich had carriages, etc.) but we’re both painting with a broad brush to get our ideas across.
