2. Studies in nutrition science are a dime a dozen. Like in psychology, you should apply common sense to interpret the results. In this case, the implication is that the Hunter gatherer lifestyle is a chronically tired lifestyle for human bodies.
> The implication of this is that somehow the sedentary lifestyle of your average couch potato is the "normal" lifestyle for a body, and the lifestyle of a hunter gatherer is "overactive", and their bodies are chronically tired and trying to reduce their metabolisms. That... seems quite unlikely.
> the implication is that the Hunter gatherer lifestyle is a chronically tired lifestyle for human bodies.
The author thinks that couch potatoes have more stress and inflammation (and probably more fidgeting, etc, too), and these things burn calories which explains the results. That's the opposite to what you say here, which is that the results suggest that being a couch potato is normal.