[newtonsfirstlaw]

The rule in history as we are finding out is that efficiency wins in the long term. We have morbidly obese people because plentiful food is the exception in history rather than the rule. When we have more humans and less food those naturally fat people are going to come into their own, provided that the less efficient high metabolism people don't have other advantages in their favor provided by that high metabolism.

And look at our brains. That much parallel processing ability and such little energy usage compared to the computation achieved. If that had to be done in silicon, the wattage would be incredible. But natural selection brings efficiency.