Should We Eat Meat?: Evolution and Consequences of Modern Carnivory: Summary & Key Insights

Our relationship with meat began as an evolutionary strategy rather than a culinary preference. For most of human prehistory, meat was not a daily indulgence but a rare, highly valued source of concentrated energy. Early hominins scavenged, then hunted, learning to cooperate in ways that profoundly shaped social behavior. In evolutionary terms, the ingestion of meat contributed to the development of larger brains—a transformation rooted in the density of animal calories compared to plant matter.

Through this lens, carnivory was instrumental in creating Homo sapiens as a cognitively superior species. The ability to digest and metabolize animal fat and protein improved energy efficiency, while cooking—another pivotal advance—made those nutrients more accessible. As I detail in the book, these changes created a metabolic balance that influenced our body size, reproductive success, and mental capacities. Meat was, quite literally, a fuel for civilization—but only within ecological limits. Ancient diets were opportunistic and local, constrained by climate, prey availability, and seasonal rhythms. There was no industrial abundance, only adaptive balance. Recognizing this original context helps us see how distant modern patterns have become from the evolutionary logic that once governed our consumption.

If evolution set the stage, history wrote the script of diverse meat cultures. From Mesopotamian feasts to hunter-gatherer traditions, meat has always been culturally saturated. In ancient Greece, sacrificial meat linked divine ritual to civic unity. In Imperial China, pork became a symbol of prosperity and domestic life. Indigenous societies integrated hunting with rituals of gratitude, maintaining cycles that balanced human demand with ecological regeneration.

Across centuries, the presence or absence of meat reflected social hierarchy. Only elites could afford frequent indulgence; peasants lived mostly on grains and vegetables. Geography and technology also mattered: nomadic herders on the steppes relied on livestock for survival, while tropical agrarian societies thrived mainly on plant foods. In reviewing these patterns, I wanted to dispel the myth of an eternal carnivore. Humanity’s historical relationship with meat was anything but uniform—it was flexible, context-dependent, and largely balanced by scarcity. That balance collapsed only with industrialization, when global trade and mechanized farming transformed meat into a commodity available to billions. The historical record thus sets up the central modern dilemma: abundance divorced from ecological restraint.