So it's not just the rise in calorie consumption which has led to the obesity epidemic. It must also be the decline in exercise. I don't mean going to gyms, I mean that 60 years ago ppl walked more, mowed the lawn with manual mowers, climbed stairs, got out of the car to open the garage, etc. I used to cycle 10 k's to school each way. And so on.
It won't be enough to cut calorie consumption. We will also have to start to exercise in the way our grandparents and great grandparents did. And (sorry, but there it is) the best way to cut calories is to adopt a mostly vegetable diet.