PolygamousRanchKid writes "If early humans had been vegans we might all still be living in caves, Swedish researchers suggested in an article Thursday. When a mother eats meat, her breast-fed child's brain grows faster and she is able to wean the child at an earlier age, allowing her to have more children faster, the article explains. 'Eating meat enabled the breast-feeding periods and thereby the time between births to be shortened,' said psychologist Elia Psouni of Lund University in Sweden. 'This must have had a crucial impact on human evolution.' She notes, however, that the results say nothing about what humans today should or should not eat."