Loosing ability to synthesize vitamin C could have been key to evolution of human beings

Humans beings can not synthesize vitamin C decreasing antioxidants in gastrointestinal tracts. Though loosing ability to synthesize vitamin C was not sufficient for evolution of human beings loosing such an ability could have been necessary for evolution of human beings. Antioxidants in gastrointestinal tracts undermine global overviews.

Humans moving out in to savannas was another key to evolution of humans beings. On savannas there are fewer fruits. Fruits are high is dietary antioxidants which undermine global overviews.