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Teeth unveil our ancestors' diet

By June 5, 2013 January 2nd, 2020 No Comments

A new analysis of early human teeth from extinct fossils has found that they expanded their diets about 3.5 million years ago to include grasses and possibly animals.

Before this, humanlike creatures – or hominins – ate a forest-based diet similar to modern gorillas and chimps.

Researchers analysed fossilised tooth enamel of 11 species of hominins and other primates found in East Africa.

The findings appear in four papers published in PNAS journal. Like chimpanzees today, many of our early human ancestors lived in forests and ate a diet of leaves and fruits from trees, shrubs and herbs.affordable dental implants london

But scientists have now found that this changed 3.5 million years ago in the speciesAustralopithecus afarensis and Kenyanthropus platyops.

Their diet included grasses, sedges, and possibly animals that ate such plants. They also tended to live in the open savannahs of Africa. The new studies show that they not only lived there, but began to consume progressively more foods from the savannahs.

Researchers looked at samples from 175 hominins of 11 species, ranging from 1.4 to 4.1 million years old.

Their diet was analysed from the chemical make up of their teeth, identifying the carbon isotopes within them.

The ratios of different types of carbon atoms, or isotopes, in fossils can give clues to what a fossil creature ate because different foods have different carbon isotope signatures.affordable cosmetic dentistry london

“What we have is chemical information on what our ancestors ate, which in simpler terms is like a piece of food item stuck between their teeth and preserved for millions of years,” said Dr Zeresenay Alemseged, from the California Academy of Sciences, co-author on two of the papers….read more

 

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