I wonder if it's related to the broader trend of lowered resting metabolic rate in humans. Not necessarily that the latter causes the former, but that some mech

I wonder if it's related to the broader trend of lowered resting metabolic rate in humans. Not necessarily that the latter causes the former, but that some mechanism is driving both: an adaptation that tells the organism that it's time to hunker down, avoid unnecessary activity/risk, and save up calories.