Thure Cerling, University of Utah (image) University of Utah Caption University of Utah geochemist Thure Cerling spearheaded a set of four new studies that revealed early humans and their ancestors and relatives made a surprising dietary switch some 3.5 million years ago, changing from an ape-like diet of mostly leaves and fruits from trees and shrubs to a grass-based diet of grasses, sedges and, perhaps in later stages, meat from grass-eating animals. Almost two dozen scientists from numerous institutions conducted the new research. Credit Lee J. Siegel, University of Utah. Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.