According to Daniel Lieberman, Chair of the Department of Human Evolutionary Biology at Harvard, over the course of millions of years, apes living in the forests of Africa changed to modern humans.
We humans were hunter-gatherers, moved frequently, lived at very low population densities, and usually walked 10-15 miles every day searching for food and water.
Lieberman explained epidemics didn’t exist prior to the emergence of agriculture. The population density of hunter-gatherers was less than one person per square kilometre, which is below the threshold necessary for fatal or deadly diseases to spread. The industrial revolution immensely altered the way we work, interact and eat, as well as allowed for rapid population growth at far greater densities, which is why the majority of people these days have better health and higher standards of living than ever before.
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