These things absolutely explain why I am fatter than you, why Jane is skinnier than Phyllis. They are useful if Jane wants to gain weight or Phyllis wants to lo

These things absolutely explain why I am fatter than you, why Jane is skinnier than Phyllis. They are useful if Jane wants to gain weight or Phyllis wants to lose it. I don't think they are are enough to explain changes in the population over time though. I don't think habits have changed that much, first of all. Maybe fewer video games were played but fewer people did fun runs and cross fit too. Either way, there definitely were some coach potatoes and office workers in the 70s and there are some now. But our coach potatoes are bigger than our parents'.