When I first started reading the Primal nutrition guide, it made me think of a subject we studied in one of my anthropology courses. The ethnography was conducted by Richard Lee over the course of a few years and addressed a foraging tribe in the Dobe area of South Africa.

The subsistence chapter may be found here: http://www.faculty.fairfield.edu/dcr...lee_chap_4.pdf

If you are interested in further readings, there are summaries here (as well as some of the impact on their lifestyles with the introduction of farming and herding): The Dobe Ju/'hoansi (Lee, 2003) - Anthropology & the Human Condition

I am sure the full chapter pdf files may be found online as well. Take from this what you will.

Lee, Richard. (2003). The Dobe Ju/'hoansi (3rd ed.). Belmont, CA: Wadsworth Thomson Learning.