Ground stones were a 'major evolutionary success' as they allowed people to unlock the energy in plants by making flour.
Image credit - José-Manuel Benito Álvarez/Wikimedia commons
Plants rich in starch helped early humans to thrive even at the height of the last Ice Age, researchers say.
While the evidence around meat eating is clear, the role of plant foods is less understood. Animal bones can last millions of years and still show cuts made by human butchering tools, whereas almost all plant remains disintegrate.
But new studies into the remains of plants that do exist are uncovering why and how our ancestors ate them.
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