Burgers, brains, and evolution: biological and philosophical roots of fat craving

The story of human evolution is often told through tools, fire, and language. Yet food, particularly fat, was equally decisive in shaping the human brain. The same lipid-driven adaptations that once supported cortical expansion and cognitive sophistication enabling the rise of civilization, now drive maladaptive eating in environments of abundance. As global societies confront escalating rates of obesity and metabolic disease, a central question arises: are modern fat cravings a misfiring of once-adaptive instincts, or do they continue to serve a deeper evolutionary role? This Perspective argues that humanity’s relationship with fat represents an outdated evolutionary adaptation that has become maladaptive in conditions of sustained surplus. The craving that is thought to have spurred intelligence may now threaten it. Understanding this paradox may open new avenues for both biomedical research and cultural adaptation.