Image of Nutcracker Man Eating Fruit (IMAGE) U.S. National Science Foundation Caption Nutcracker Man's diet has been a source of scientific debate because his powerful jaws, huge molars and big, flat cheek teeth indicated he probably fed on nuts and seeds or roots and tubers. But new research shows he most likely ate grass and possibly sedges. Credit Nicolle Rager Fuller, National Science Foundation Usage Restrictions None License Licensed content 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.