If you are mashing up the food and not chewing it you are not imbuing it with Saliva. This is part of the process of digestion, so it skipping this step is not as good.
There seems to be an implication here that the Life expectancy was always low and had not gone down due to industrialisation and city living. What is/was the mortality rate in tribal peoples at various stages of history?
While we're thinking about how it was in the old days, let's not forget what the life expectancy was.
In the 18th century you were lucky to survive childhood. When I was born, infant mortality rates were more than three times what they are now.
There's a lot to be said for some of the old ways, but nutrition and medicine aren't included.
There seems to be an implication here that the Life expectancy was always low and had not gone down due to industrialisation and city living. What is/was the mortality rate in tribal peoples at various stages of history?