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The person you are replying to didn't say "expend more energy", they said "exercise more", and the link you gave comfirms that: As expected, physical activity
by mehwoot 10y ago
The person you are replying to didn't say "expend more energy", they said "exercise more", and the link you gave comfirms that:
As expected, physical activity level, PAL, was greater among Hadza foragers than among Westerners.
- searine 10y ago>As expected, physical activity level, PAL, was greater among Hadza foragers than among Westerners. Within a standard deviation. Higher on average, but not much, and not significantly. No where near enough to exert selection pressure.
- mehwoot 10y agoWithin a standard deviation (just) of the hunter gatherers, but not for Western males. PAL is 2.26 +- 0.48 for Hadza male and 1.81 +- 0.21 for Western Male. That's an average 25% difference in activity. I'm not a biologist but it seems like that could surely be significant. Especially if the protein being talked about is generated by strenuous activity above some level. 25% total difference in activity could be a very large difference in activity above a threshold, since both groups are going to spend a lot of the day sitting around, sleeping or walking slowly.
- Declanomous 10y agoSelection pressure doesn't care about standard deviations, believe it or not. Even a small difference can exert evolutionary pressure over a long period of time. Minute changes are actually a huge part of evolution. Evolution is much more about minute changes than it is about huge (standard-deviation-level) changes.