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Impact of meat and Lower Palaeolithic food processing techniques on chewing in humans

Overview of attention for article published in Nature, March 2016
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About this Attention Score

  • In the top 5% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (99th percentile)
  • High Attention Score compared to outputs of the same age and source (99th percentile)

Mentioned by

news
160 news outlets
blogs
18 blogs
twitter
300 tweeters
facebook
30 Facebook pages
wikipedia
1 Wikipedia page
googleplus
27 Google+ users
reddit
2 Redditors
video
1 video uploader

Readers on

mendeley
125 Mendeley
Title
Impact of meat and Lower Palaeolithic food processing techniques on chewing in humans
Published in
Nature, March 2016
DOI 10.1038/nature16990
Pubmed ID
Authors

Katherine D. Zink, Daniel E. Lieberman, Zink, Katherine D, Lieberman, Daniel E

Abstract

The origins of the genus Homo are murky, but by H. erectus, bigger brains and bodies had evolved that, along with larger foraging ranges, would have increased the daily energetic requirements of hominins. Yet H. erectus differs from earlier hominins in having relatively smaller teeth, reduced chewing muscles, weaker maximum bite force capabilities, and a relatively smaller gut. This paradoxical combination of increased energy demands along with decreased masticatory and digestive capacities is hypothesized to have been made possible by adding meat to the diet, by mechanically processing food using stone tools, or by cooking. Cooking, however, was apparently uncommon until 500,000 years ago, and the effects of carnivory and Palaeolithic processing techniques on mastication are unknown. Here we report experiments that tested how Lower Palaeolithic processing technologies affect chewing force production and efficacy in humans consuming meat and underground storage organs (USOs). We find that if meat comprised one-third of the diet, the number of chewing cycles per year would have declined by nearly 2 million (a 13% reduction) and total masticatory force required would have declined by 15%. Furthermore, by simply slicing meat and pounding USOs, hominins would have improved their ability to chew meat into smaller particles by 41%, reduced the number of chews per year by another 5%, and decreased masticatory force requirements by an additional 12%. Although cooking has important benefits, it appears that selection for smaller masticatory features in Homo would have been initially made possible by the combination of using stone tools and eating meat.

Twitter Demographics

The data shown below were collected from the profiles of 300 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 125 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
United States 7 6%
Germany 3 2%
Estonia 1 <1%
Portugal 1 <1%
United Kingdom 1 <1%
Brazil 1 <1%
Ireland 1 <1%
Japan 1 <1%
Belgium 1 <1%
Other 1 <1%
Unknown 107 86%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 31 25%
Researcher 24 19%
Student > Master 17 14%
Student > Bachelor 16 13%
Professor 9 7%
Other 28 22%
Readers by discipline Count As %
Agricultural and Biological Sciences 46 37%
Arts and Humanities 12 10%
Biochemistry, Genetics and Molecular Biology 9 7%
Social Sciences 9 7%
Medicine and Dentistry 9 7%
Other 40 32%

Attention Score in Context

This research output has an Altmetric Attention Score of 1666. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 25 July 2017.
All research outputs
#485
of 8,081,131 outputs
Outputs from Nature
#127
of 47,293 outputs
Outputs of similar age
#44
of 284,094 outputs
Outputs of similar age from Nature
#10
of 1,056 outputs
Altmetric has tracked 8,081,131 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 47,293 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 73.8. This one has done particularly well, scoring higher than 99% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 284,094 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 1,056 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 99% of its contemporaries.