Evolution and seasonality are inextricably intertwined. This isn’t a negotiable, controversial statement, because evolution describes an organism’s response to environmental pressures, and the seasons are part of the environment. Another uncontroversial statement is that the study of human evolution can give us insight into what constitutes a healthy lifestyle for modern humans. I think it’s reasonable, then, to suggest that understanding how seasonality affected human evolution might give even more insight into best practices.
Most examinations of prehistoric climate change deal with average global temperatures, which can explain overall worldwide trends in climate, but when we’re talking about human evolution – that is, on the changes in the human organism that resulted from immediate, localized environmental pressures – knowing the mean global average doesn’t tell us much. To understand how seasonality affected our development, we need to look beyond the global trends. We need to look at specific climate conditions.

The seasons […]

Original post by Mark Sisson

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