The assumptions lead to these observations:

•   We are Pleistocene beings in a post-industrial world

•   Our environment is no longer Pleistocene

pollution, greater solar radiation, new chemicals, new diseases affect our Pleistocene bodies

•   Our Pleistocene bodies and Paleolithic minds have activity levels, activity types and stresses that are far from Paleolithic

we are not as active as the hunter-gatherers were; modern fitness activity is different in nature from the activity that drove human evolution.  Sleep patterns, stress, mass society and technology assault our minds and bodies in ways for which we have no natural defences (the epidemics of modern non-communicable diseases are symptoms of these changes)

•   Our diet is no longer Pleistocene

for 5m years we ate fresh fruit and vegetables, fresh meat and fish and drank water; now we eat processed grains, milk and primarily manufactured, processed and treated foods.  Even fresh fruit, vegetables and meat have been altered by pollution, chemicals, soil depletion and farming practices.  Our physiology has had no time to adapt to these features of the modern diet.

Evfit Home  To elaborate on these observations, go to Stephen Boyden's paper