AI Insight
A study published in Nature Ecology and Evolution analyzed human and animal remains from Sri Lankan tropical rainforests spanning approximately 20,000 to 3,000 years ago. Using zinc isotope analysis of tooth enamel to determine trophic position and dietary composition, researchers found that plant consumption among these human populations began increasing thousands of years before the introduction of agriculture. This suggests that dietary shifts toward plant-based foods were a gradual process that preceded, rather than coincided with, the adoption of formal agricultural practices.
Why it matters
These findings challenge the assumption that increased plant reliance was driven primarily by the emergence of agriculture, offering new insight into how and why early human populations adapted their diets over time. Understanding these long-term dietary transitions may inform broader research into human evolution, subsistence strategies, and the conditions that eventually led to agricultural development.
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. The research focuses on human and animal remains dating from approximately 20,000 to 3,000 years ago and 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.
Source: Sri Lanka teeth reveal rising plant diets thousands of years before agriculture