If gasoline is expensive and you have a lot of driving to do, then you want a car that can do a lot of driving without burning much gas. Similarly, if food is hard to get and you have a lot of physical labor to do, then you want a body that can do a lot of exercise without burning many calories.
So, most of human history has encouraged the survival of fuel-efficient bodies that gain weight easily and don’t lose it easily. They can lose weight if they try hard enough, but in some cases, the amount they would have to try would be enough work to comprise a full-time job.
The rest of this essay has been taken down for inclusion in my next memoir. Stay tuned for updates.