Grass-based Diet

Our ancestors made the shift from a diet based on trees and shrubs to grass-based foods -- that include not only grasses and their roots, but also insects or animals that ate grass -- roughly 400,000 years earlier than experts previously thought, says new research.

Our ancestors made the shift from a diet based on trees and shrubs to grass-based foods -- that include not only grasses and their roots, but also insects or animals that ate grass -- roughly 400,000 years earlier than experts previously thought, says new research.