When it comes to ways to burn calories, few people think of chewing. But about 3% of the daily energy we burn comes from grinding gum, gristle, and other goodies, a new study finds.
When it comes to ways to burn calories, few people think of chewing. But about 3% of the daily energy we burn comes from grinding gum, gristle, and other goodies, a new study finds—and maybe more if you’re partial to salads and celery stalks. That’s far less than walking or even digesting, but it may have been enough to reshape the faces of our distant ancestors.
Scientists have long suspected our jaw size and tooth shape evolved to make chewing more efficient. As our hominid ancestors shifted their diet to easier to chew foods and developed technologies such as chopping and cooking to reduce the time and effort spent chewing, jaw and tooth shape changed, too, shrinking compared with other primates.
The findings came as a surprise. Henry says even some of her collaborators were skeptical that the energy required to chew would be enough to measure in the lab. “I think it’s a great study. It shows there’s a measurable amount of energy used,” Ross says.
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