... as further evidence (not proof, but evidence), there was recently a TV show about surviving in Alaska. There was a group of 8 or so city people who went to Alaska to see if they could survive.
They broke up into "hunters" and "gatherers" so they could work together. Although they found hunting to be difficult, they also found gathering to be difficult.
Furthermore, during a time when they were unsuccessful at hunting, they ate only foods they could gather. And within a few days, they were all feeling lethargic and non-energetic. They soon realized that their bodies were shutting down because they could not get enough food to sustain themselves just from gathering.
Once they finally had an animal kill, they all started feeling better and they made a decision to make sure they focused on hunting from then on.
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