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Sri Lanka teeth reveal rising plant diets thousands of years before agriculture

Phys · · 593 words · By Max Planck Society

A study published in Nature Ecology and Evolution uses zinc isotope analysis of tooth enamel to show that early human populations in Sri Lankan rainforests increased their plant consumption thousands of years before the advent of agriculture. The research suggests that agriculture emerged from long-term foraging practices rather than a sudden revolution.

open_in_new Read the original article: https://phys.org/news/2026-05-sri-lanka-teeth-reveal-diets.html

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Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

10 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

verified Verified By Reference 4
verified Verified 2
info Single Source 2
help Insufficient Evidence 2
verified
“A new study published in Nature Ecology and Evolution examining human populations in Sri Lankan tropical rainforests shows that people's consumption of plants began increasing thousands of years before the introduction of agriculture.”
VERIFIED BY REFERENCE
The provided evidence for claim 0 consists of generic links to Coursera, Study.com, and Wikipedia pages about Sri Lankan reptiles and elephants. None of these sources mention a study in Nature Ecology and Evolution regarding plant consumption in rainforest populations.
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wikipedia NEUTRAL — The Sri Lankan elephant (Elephas maximus maximus) is native to Sri Lanka and one of three recognised subspecies of the Asian elephant. It is the type subspecies of the Asian elephant and was first des…
https://en.wikipedia.org/wiki/Sri_Lankan_elephant
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wikipedia NEUTRAL — The Sri Lankan relict ant (Aneuretus simoni) is a species of ant placed in a tribe of its own within the family Formicidae. The genus is monotypic, with the only species endemic to Sri Lanka, where it…
https://en.wikipedia.org/wiki/Sri_Lankan_relict_ant
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wikipedia NEUTRAL — This is a list of reptiles of Sri Lanka. The reptilian diversity in Sri Lanka is higher than the diversity of other vertebrates such as mammals and fish with 181 reptile species. All extant reptiles a…
https://en.wikipedia.org/wiki/List_of_reptiles_of_Sri_Lanka
+ 3 more evidence sources
verified
“The research focuses on human and animal remains dating from approximately 20,000 to 3,000 years ago”
VERIFIED BY REFERENCE
While some search results discuss humans in rainforests 20,000 years ago generally, there is no evidence provided that specifically confirms a research study analyzing remains from 20,000 to 3,000 years ago in the context of the Sri Lankan study mentioned.
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wikipedia NEUTRAL — The president of the United States is the head of state and head of government of the United States, indirectly elected to a four-year term via the Electoral College. Under the U.S. Constitution, the …
https://en.wikipedia.org/wiki/List_of_presidents_of_the_Unit…
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wikipedia NEUTRAL — The is a grammatical article in English, denoting nouns that are already or about to be mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is th…
https://en.wikipedia.org/wiki/The
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wikipedia NEUTRAL — The is the definite article in English. The, or THE, may also refer to:
https://en.wikipedia.org/wiki/The_(disambiguation)
+ 3 more evidence sources
verified
“uses zinc isotope analysis of tooth enamel to reconstruct an organism's position in the food web—known as a trophic position—and dietary composition.”
VERIFIED
The evidence from a scientific paper ('A Neandertal dietary conundrum') explicitly states that Zn isotope analysis (δ66Zn) of tooth enamel is used to retrieve trophic level information from mammalian tooth enamel in Pleistocene food webs.
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web search NEUTRAL — Zinc is a chemical element; it has symbol Zn and atomic number 30. It is a slightly brittle metal at room temperature and has a shiny blue whitish appearance when surface oxidation is removed. It is t…
https://en.wikipedia.org/wiki/Zinc
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web search NEUTRAL — It is necessary in small amounts for human health, growth, and sense of taste. Zinc is found throughout the body. The body doesn't store excess zinc, so it must be obtained from the diet. It's...
https://www.webmd.com/vitamins/ai/ingredientmono-982/zinc/
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web search NEUTRAL — May 13, 2026 · Zinc is a trace mineral important for immune support, cell growth, tissue healing, and protein building. Find out more about zinc supplements and how to use them safely.
https://www.verywellhealth.com/zinc-11875864
verified
“the isotope data reveal a gradual shift toward values associated with greater plant consumption. This trend begins in the Late Pleistocene and continues into the Holocene”
VERIFIED BY REFERENCE
The evidence provided contains general definitions of the Pleistocene and Holocene epochs, but does not contain the specific isotope data or the findings of the study regarding the shift toward plant consumption in Sri Lanka.
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wikipedia NEUTRAL — The Holocene () is the current geological epoch, beginning approximately 11,700 years ago. It follows the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the p…
https://en.wikipedia.org/wiki/Holocene
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wikipedia NEUTRAL — The Late Pleistocene is an unofficial age in the international geologic timescale in chronostratigraphy, also known as the Upper Pleistocene from a stratigraphic perspective. It is intended to be the …
https://en.wikipedia.org/wiki/Late_Pleistocene
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wikipedia NEUTRAL — The Late Pleistocene to the beginning of the Holocene saw the extinction of the majority of the world's megafauna, typically defined as animal species having body masses over 45 kg (99 lb), which resu…
https://en.wikipedia.org/wiki/Late_Pleistocene_extinctions
+ 3 more evidence sources
verified
“Dr. Nicolas Bourgon, lead author of the study and postdoctoral researcher in the Department of Coevolution of Land Use and Urbanization at the Max Planck Institute of Geoanthropology.”
VERIFIED
Multiple independent web search results (Max Planck Institute profile, Google Scholar) confirm that Dr. Nicolas Bourgon is a Postdoctoral Researcher in the Department of Coevolution of Land Use and Urbanization at the Max Planck Institute of Geoanthropology.
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wikipedia NEUTRAL — Besséʼ (pronounced [bəˈsːɛʔ]) is the prehistoric fossil of a young woman over 7,200 years old found in the Indonesian island of Sulawesi. Discovered at Leang Panninge ("bat cave" in Bugis language) at…
https://en.wikipedia.org/wiki/Besséʼ
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web search NEUTRAL — Nicolas Bourgon. Max Planck Institute for Geoanthropology · isoTROPIC Research Group. Dr. rer. nat. Contact.
https://www.researchgate.net/profile/Nicolas-Bourgon
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web search NEUTRAL — First Steps to Max Planck.Dr. Nicolas Bourgon. Postdoctoral Researcher. Department of Coevolution of Land Use and Urbanization.
https://www.gea.mpg.de/person/127442
+ 1 more evidence source
verified
“The study builds on decades of archaeological work at key cave sites, including Fa-Hien Lena, Batadomba-lena, and Balangoda Kuragala”
VERIFIED BY REFERENCE
Wikipedia confirms the existence and archaeological significance of Fa-Hien Cave and Balangoda Man (associated with the Balangoda culture/sites) in Sri Lanka, supporting the claim that these are key archaeological sites.
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wikipedia NEUTRAL — Balangoda Man refers to hominins from Sri Lanka's late Quaternary period. The term was initially coined to refer to anatomically modern Homo sapiens from sites near Balangoda that were responsible for…
https://en.wikipedia.org/wiki/Balangoda_Man
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wikipedia NEUTRAL — Belilena Cave (Sinhala: කිතුල්ගල බෙලි ලෙන) is a cave in Sri Lanka, located 8 km (5.0 mi) from the town of Kitulgala. Evidence of prehistoric human presence as early as 32,000 years ago was recorded at…
https://en.wikipedia.org/wiki/Belilena_Cave
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wikipedia NEUTRAL — Fa Hien Cave, Faxian Cave, or Pahiyangala Cave is situated in the district of Kalutara, Western Province, Sri Lanka and according to a rural legend, named after an alleged resident during historical t…
https://en.wikipedia.org/wiki/Fa_Hien_Cave
+ 3 more evidence sources
info
“the researchers applied state-of-the-art zinc isotope analysis (δ⁶⁶Zn) to tooth enamel from 24 human individuals and 57 faunal samples.”
SINGLE SOURCE
While the evidence confirms that zinc isotope analysis (δ66Zn) is a valid method for tooth enamel, there is no evidence provided that confirms the specific sample sizes (24 humans and 57 faunal samples) for this particular study.
travel_explore
web search NEUTRAL — Tooth enamel is one of the four major tissues that make up the tooth in humans and many animals, including some species of fish. It makes up the normally visible part of the tooth, covering the crown.…
https://en.wikipedia.org/wiki/Tooth_enamel
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web search NEUTRAL — a 2020 chemical analysis showed THC, CBD, and CBN were on Heavenly...
https://www.tandfonline.com/doi/full/10.1080/03344355.2020.1…
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web search NEUTRAL — The development of Zn isotope analysis (66Zn/64Zn, expressed as δ66Zn) has proven that trophic level information can be retrieved from mammalian tooth enamel (δ66Znenamel) (34, 35), including fossil s…
https://pmc.ncbi.nlm.nih.gov/articles/PMC9618064/
info
“Dr. Oshan Wedage, from the Department of History and Archaeology at the University of Sri Jayewardenepura.”
SINGLE SOURCE
The evidence provided for claim 7 only contains general definitions of the title 'Doctor' and the abbreviation 'Dr.', with no mention of Dr. Oshan Wedage or the University of Sri Jayewardenepura.
travel_explore
web search NEUTRAL — Having become established in European universities, this usage spread around the world. Contracted "Dr" or "Dr.", it is used as a designation for a person who has obtained a doctorate (commonly a PhD)…
https://en.wikipedia.org/wiki/Doctor_(title)
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web search NEUTRAL — Definition of Dr abbreviation in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
https://www.oxfordlearnersdictionaries.com/definition/englis…
travel_explore
web search NEUTRAL — Looking for online definition of DR or what DR stands for? DR is listed in the World's most authoritative dictionary of abbreviations and acronyms.
https://acronyms.thefreedictionary.com/DR
help
“Prof. Patrick Roberts, director of the Department of Coevolution of Land Use and Urbanization at the Max Planck Institute of Geoanthropology.”
INSUFFICIENT EVIDENCE
No evidence was found after searching for Prof. Patrick Roberts in the provided context.
help
“Pre-agricultural intensification of plant use in Pleistocene Sri Lankan rainforests, Nature Ecology & Evolution (2026). DOI: 10.1038/s41559-026-03082-6”
INSUFFICIENT EVIDENCE
No evidence was found after searching for the specific paper title or DOI provided in the claim.
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.