Some people have medical issues causing obesity, sure, but we’re the same species we were 50 years ago. Any physiological cause of obesity in people today was a

Some people have medical issues causing obesity, sure, but we’re the same species we were 50 years ago. Any physiological cause of obesity in people today was also present then, presumably at the same rates. But they didn’t have an obesity epidemic. Whatever thing (or set of things) is driving the change in obesity rates, it is not a biological force that is outside of out control.