3. –
Conklin-Brittain NL, Wrangham R, Smith CC
(2002) A two-stage model of increased dietary
quality in early hominid evolution: The role of
fiber. In: Ungar PS, Teaford MF, editors. Human
diet: Its origin and evolution: Greenwood
% calories (Assuming 1.5 cal. fat/1 gr fiber)
Full explanation and references at http://www.paleostyle.com/?p=2001