I seriously question assertions 1 and 3. I don't have any reason to doubt 2. I'd put a huge asterisk on 4.
1) Typically about 80% of the paleolithic diet came from gathering. Gathering sufficient food to provide about 900
digestible calories per day, with enough variation to provide all the required nutrients probably took more than 2 hours, especially during winter. Hunting with primitive weapons is a dubious thing (anybody here ever tried to hunt with a spear? a bow and arrow made from sticks, a stone, and plant-fiber twine?) and probably involved much more than 2 hours a day and had a low success rate.
3) The sources I've found put paleolithic life expectancies between 33 and 54 (if you made it past 15 years old, you had a good chance of making it to 39-54). In the neolithic, life expectancy was about 20. Could you point me to your source?
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The above ONLY apply to those who were strictly hunter gatherer, not the hybreds like native americans who tended to also farm on the side.
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The problem with that is that paleolithic populations were processing cereal grains for food some 23000 years ago, with evidence suggesting as early as 200,000 years ago (
Piperno, D; Weiss, E., Hols, I., Nadel, D (2004), 200,000 years from
People, Plants and Genes: The Story of Crops and Humanity. Oxford: Oxford University Press.). Everybody would be, as you termed it, a hybrid.
FYI, both the American Dietic Association and the National Health Service of England have designated the
"Paleolithic diet" (aka caveman diet) as a
fad diet.