A Grassy Trend in Human Ancestors' Diets

Most apes eat leaves and fruits from trees and shrubs. But new studies show that human ancestors expanded their menu 3.5 million years ago, adding tropical grasses and sedges to an ape-like diet. The change set the stage for consuming more modern fare: grains, grasses, and meat and dairy from grazing animals.

Four studies of carbon isotopes were conducted in fossilized tooth enamel from scores of human ancestors and baboons in Africa from 4 million to 10,000 years ago. To learn more, read the full article on the NSF website: https://www.nsf.gov/news/news_summ.jsp?cntn_id=128106&WT.mc_id=USNSF_51&WT.mc_ev=click