Evidence map›Paper›PMID 33941703›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2021

A global carbon and nitrogen isotope perspective on modern and ancient human diet.

Michael I Bird, Stefani A Crabtree, Jordahna Haig, Sean Ulm, Christopher M Wurster

Open access · greenAbstract readHistorical Article
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.

0numbers the graph read from it
0cells of the map it votes in
13citing papers in PubMed
5.0field-weighted citation impact, top 5% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

13 citing papers in PubMed, 44 citations in OpenAlex.

  1. Article
  2. Review
  3. Fifteen thousand years of bioarchaeological data reveal life history trade-offs among Europe's first farmers.Proceedings of the National Academy of Sciences of the United States of America · 2026
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  4. Article
  5. Article
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  11. Human diet of premodern mainland Japan: a meta-analysis of carbon and nitrogen stable isotope ratios.Anthropological science : journal of the Anthropological Society of Nippon = Jinruigaku zasshi · 2024
    Article
  12. Review
  13. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 2 institutions in 2 countries.

Michael I BirdAustralian Research Council Centre of Excellence for Australian Biodiversity and Heritage, James Cook University, Cairns, QLD 4870, Australia; michael.bird@jcu.edu.au.ORCID 0000-0003-1801-8703
Stefani A CrabtreeDepartment of Environment and Society, Utah State University, Logan, UT 84322.ORCID 0000-0001-8585-8943
Jordahna HaigAustralian Research Council Centre of Excellence for Australian Biodiversity and Heritage, James Cook University, Cairns, QLD 4870, Australia.
Sean UlmAustralian Research Council Centre of Excellence for Australian Biodiversity and Heritage, James Cook University, Cairns, QLD 4870, Australia.ORCID 0000-0001-6653-9963
Christopher M WursterAustralian Research Council Centre of Excellence for Australian Biodiversity and Heritage, James Cook University, Cairns, QLD 4870, Australia.ORCID 0000-0002-2866-5798
Australian Research Council · AUUtah State University · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Stable carbon and nitrogen isotope analyses are widely used to infer diet and mobility in ancient and modern human populations, potentially providing a means to situate humans in global food webs. We collated 13,666 globally distributed analyses of ancient and modern human collagen and keratin samples. We converted all data to a common "Modern Diet Equivalent" reference frame to enable direct comparison among modern human diets, human diets prior to the advent of industrial agriculture, and the natural environment. This approach reveals a broad diet prior to industrialized agriculture and continued in modern subsistence populations, consistent with the human ability to consume opportunistically as extreme omnivores within complex natural food webs and across multiple trophic levels in every terrestrial and many marine ecosystems on the planet. In stark contrast, isotope dietary breadth across modern nonsubsistence populations has compressed by two-thirds as a result of the rise of industrialized agriculture and animal husbandry practices and the globalization of food distribution networks.

Indexed as

AlgorithmsBone and BonesCarbon IsotopesCollagenDietGeographyGlobal HealthHairHistory, 20th CenturyHistory, 21st CenturyHistory, AncientHumansKeratinsNailsNitrogen IsotopesCarbon IsotopesCollagenKeratinsNitrogen Isotopesdietisoscapeisotopetrophic

Identifiers

PMID33941703
PMCPMC8126777
OpenAlexW3157746434

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.