Analysis of fossilized tooth enamel from ancient Australopithecus individuals shows chemical signatures that match those of animals eating mostly plants, not meat, suggesting they did not regularly...
Mechanism
Synthesis from 1 study
These ancient ancestors ate mostly plants like leaves and fruits, and their teeth absorbed the chemical fingerprints of those plants as they grew. Since their teeth don’t show the chemical signs of eating meat, it means they weren’t regularly consuming animals.
Most probable mechanism
When an animal eats mostly plants like leaves, fruits, and roots, the carbon and nitrogen from those plants get built into its teeth as they grow. These elements carry a chemical signature that matches the plants they came from, not from meat. Since the teeth of these ancient ancestors show this plant signature and not the one seen in meat-eaters, it means they were eating plants, not animals, as their main food.
Dietary intake of C3 plants, such as leaves, fruits, and tubers, provides carbon and nitrogen compounds with distinct isotopic ratios.
These isotopic signatures are incorporated into developing tooth enamel during mineralization through metabolic pathways that retain the original isotopic composition of dietary sources.
The isotopic profile of tooth enamel reflects long-term dietary patterns and remains chemically stable after formation, preserving evidence of dietary composition over years.
The absence of isotopic signatures characteristic of mammalian tissue consumption indicates no significant incorporation of animal-derived carbon or nitrogen into the diet.
Evidence from Studies
Supporting (1)
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Australopithecus at Sterkfontein did not consume substantial mammalian meat.
Contradicting (0)
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Gold Standard Evidence Needed
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