I think you may have hit on part of the answer in the questions that you are asking. I was hoping to see some other commentor mention just exactly what these stone tools were used for and therefore what effect they had on our bodies. While you can use Stone to make all kinds of tools including mortars and pestles, which would help with processing grains and vegetables, the primary kind of stone tools that you're referring to here are projectile points. They were used to kill animals. This suggests that starting close to 3 million years ago our diet changed dramatically. From being seasonal frutarians and opportunistic gatherers throughout the year,... (read more)
I think you may have hit on part of the answer in the questions that you are asking. I was hoping to see some other commentor mention just exactly what these stone tools were used for and therefore what effect they had on our bodies. While you can use Stone to make all kinds of tools including mortars and pestles, which would help with processing grains and vegetables, the primary kind of stone tools that you're referring to here are projectile points. They were used to kill animals. This suggests that starting close to 3 million years ago our diet changed dramatically. From being seasonal frutarians and opportunistic gatherers throughout the year,... (read more)