Recent archaeological findings are reshaping our understanding of human evolution, particularly the role of diet in early human life. The long-held view that meat was the primary component of early diets, with plants gaining importance only after agriculture began, is being challenged.
A recent study published in the Journal of Archaeological Research provides new insights indicating that early humans across various regions were actively gathering, cooking, and processing wild plants tens of thousands of years before farming emerged. This research paints a picture of a much more nutritionally varied prehistoric diet than previously recognized, showcasing a mix of seeds, nuts, and starchy roots.
Grinding Stones and Root Ovens: Evidence from Our Past
This study, conducted by researchers from the Australian National University and the University of Toronto Mississauga, utilized archaeological evidence from sites in Africa, the Levant, Southeast Asia, and Australia. These findings include grinding stones and charred remains of plants, evidencing prehistoric plant food preparation that dates back at least 35,000 years, possibly even earlier.
For instance, at Ohalo II in Israel, dating to 23,000 years ago, archaeologists found grinding tools with starch remnants alongside preserved wild wheat, barley, and legumes. Meanwhile, at Madjedbebe in Northern Australia, remnants on stone tools suggest the processing of yams and seeds over 65,000 years ago—the oldest known human site in the region.
This comprehensive analysis undermines the prevailing belief that early humans primarily depended on hunting large animals. Instead, it reveals a strong tradition of plant-based survival strategies well before domestication began.
The Need for More Than Meat
Humans have biological limitations on how much lean meat they can digest. A diet high in protein without sufficient fats or carbohydrates can lead to conditions like rabbit starvation, which results in nausea and weakness. Therefore, early humans required a more balanced intake that included complex carbohydrates and plant-derived fats.
Plant foods, especially those that needed processing, were crucial as they provided a dense and renewable source of energy. Ready-to-eat roots, nuts, and seeds were essential for groups traveling across challenging terrains, including deserts and savannas.
Rethinking the “Broad Spectrum Revolution”
Historically, archaeologists viewed the late pre-agricultural era as a “Broad Spectrum Revolution,” where humans expanded their diets by incorporating smaller game and plant foods that supposedly led to agriculture. However, this fresh research suggests a different narrative.
Rather than marking a sudden dietary shift, the authors argue that humans were always broad-spectrum foragers, a characteristic inherent to our species since its early days. They propose the term “Broad Spectrum Species” to describe this enduring adaptability. Rather than being a mere precursor to farming, the inclusion of diverse plant foods represents a longstanding evolutionary strength.
This dietary flexibility might explain why Homo sapiens, unlike other hominins, adapted successfully to a variety of ecosystems. Access to both animal protein and wild carbohydrates enabled humans to thrive in environments that could not support one type of food source alone.
Today, around 80% of the average human diet is plant-based. While often attributed to modern agricultural practices, these findings suggest a much deeper historical connection to plants—one forged through thousands of years of innovation and experimentation with natural resources.
