Hominin Tooth Enamel Nanostructure Evolved to Accommodate Dietary Shifts to Tougher Foods

Researchers have identified a correlation between the nanostructure of tooth enamel and dietary transitions throughout human evolution. A study published in *Nature* reveals that the arrangement of hydroxyapatite crystals within enamel changed as early hominins shifted from consuming soft, forest-based foods to tougher, more abrasive resources in open environments. These structural variations provide new data on how dental durability evolved to accommodate changing nutritional needs over millions of years.

The investigation utilized high-resolution imaging to examine the enamel of fossilized teeth from various hominin species. The findings show that the orientation and density of these microscopic crystals directly influence the mechanical properties of the teeth, such as their resistance to fracture and wear. By comparing these nanostructures across different evolutionary timelines, the researchers mapped how dental architecture adapted to the consumption of harder foods, such as seeds, tubers, and fibrous plants. This analysis offers a clearer understanding of the biological mechanisms that allowed early humans to exploit diverse ecological niches as their diets expanded.

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Date: June 3, 2026

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GOAI