Dr. Mills has spent years studying human molars, and what he found overturns a claim heard around dinner tables everywhere: that our teeth prove we evolved to eat meat. The reality is far different—human teeth tell the story of an ancient, plant-heavy past.
For generations, the sharp appearance of human incisors has fueled the assumption that our front teeth were designed for tearing flesh. But anthropological research reveals something more nuanced. Like other herbivores, human teeth sit close together and are relatively flat, perfectly suited for processing soft fruits and vegetables. Our canines, which look somewhat pointed compared to our molars, aren't specialized meat-ripping tools at all—they're similar to those found in other apes, who use them primarily for display or defense. The real evidence lies in the entire mouth. Humans have fleshy lips, smaller mouth openings, and jaws that move freely up and down and side to side, allowing us to grind and crush food with precision. This is fundamentally different from carnivores like cats and wolves, whose jaws operate like hinges and whose teeth space widely apart in blade-like formations built for shredding flesh.
Fossil records provide compelling support for this anatomical story. Researchers analyzing preserved tartar on the teeth of Australopithecus sediba individuals from South Africa nearly two million years ago found microscopic silica particles from plants: bark, leaves, sedges and grasses. The image of Neanderthals as brutish meat-hunters has also crumbled under scrutiny. Amanda Henry and colleagues from Leiden University discovered traces of legumes, dates and wild barley in Neanderthal tooth tartar. Karen Hardy's team at the University of Glasgow found roasted starch granules in Neandertal teeth, evidence they ate cooked vegetables. Most striking, Laura Weyrich's analysis of DNA preserved in the tartar of Neanderthals from El Sidrón cave in Spain revealed pine nuts, moss and mushrooms—and no meat whatsoever.
This pattern extends across our whole evolutionary history. A recent analysis published in the Journal of Archaeological Research reviewed sites worldwide and concluded that humans evolved as "broad-spectrum" eaters, relying on diverse food sources rather than primarily on animal protein. Early humans were skilled at gathering and processing a remarkable range of plants long before agriculture emerged.
The comparison with our closest living relatives further challenges the meat-centered narrative. Chimpanzees and gorillas, despite sharing a common ancestor with humans, maintain diets where plant materials comprise 87 to greater than 99 percent of their annual food intake, according to research in the Journal of Nutrition. They are not the meat-eaters popular imagination suggests.
What emerges from this evidence is a portrait of human ancestors as flexible, resourceful omnivores who drew heavily on plant foods throughout our evolutionary journey. Our teeth, far from being weapons designed for predation, reflect millions of years of adaptation to a predominantly plant-based diet—a fact now difficult to ignore for anyone willing to read the science.