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Eating agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime and food processing agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime from two million years agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime helped us to evolve and develop language. Researchers say that learning to cut up meat and use agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime tools to process food were crucial agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime in our evolution. The fact that we cut food up meant we used agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime time for chewing. This gave us more time to develop language and communicate. The researchers estimate that cutting up food saved agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime humans as many as 2.5 million agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime per year. In agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime, chimpanzees spend half the day chewing, which means they have less agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime to communicate.

Researchers also say the agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime of our face changed because we needed to chew less. Our agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime and teeth became smaller. Professor Daniel Lieberman said: "We went from having…big teeth and large agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime muscles to having smaller teeth [and] smaller chewing agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime. Those agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime…allowed for the selection for speech and other agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime in the head, like bigger brains." Dr Lieberman chewed raw meat to test his agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime. He said: "You chew and you chew and you chew and you chew, and agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime happens." He said that slicing agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime before chewing, "is the agochangeschewingchewscontrastearlyhabitsjawslessmeatmusclesnothingshapeshiftssimplestskillsstepsstonetheorytime technology of all".