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   basic      big      changes      chewing      chews      crucial      extent      habits      half      jaws      less      million      mouths      nothing      other      process      shape      simplest      speech      theory  
Eating and food processing skills from around two years ago helped humans to evolve and develop language. Researchers from Harvard University say that learning to cut meat up and using stone tools to process food were steps in our evolutionary . The fact that we cut food up or pounded and crushed it meant we needed time for chewing. This gave our more free time to develop language and communicate. The researchers estimate that cutting up meat and food saved early humans as many as 2.5 million per year. In contrast, the chimpanzee spends of its day chewing, which means it has less time to communicate.

The researchers also said the of our face changed because we needed to chew less. Our and teeth became smaller because we had learnt to cut up food. Professor Daniel Lieberman said: "We went from having snouts and teeth and large muscles to having smaller teeth, smaller chewing muscles, and snoutless faces. Those , and others, allowed for the selection for and other shifts in the head, like bigger brains." Dr Lieberman chewed raw goat meat to test his . He said: "You chew and you chew and you chew and you chew, and happens." He added that to some , slicing meat into smaller pieces before chewing, "is the technology of all".

 
 

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