The eskimoes gut ecology probably adapted to that type of eating. They probably had more proteolytic bacteria to help break down the higher protein content. In cold weathers fat and protein increase metabolism and seems to work better in colder climates. Whereas in hotter climates fruits and veggies or light foods seem to help keep the body cool to adapt to the environment. Probably why we crave more light foods in the summer time and more fatty foods in the winter. I can definetly relate to this as I have a outside job.