Age-related diseases are not preventable: they are the price of adaptation

A radical reframing of aging challenges the dominant paradigm that non-communicable diseases result from modern lifestyles. The "Adaptive Cost Hypothesis" proposes that atherosclerosis, metabolic dysfunction, and immune senescence—observed even in populations with optimal healthcare access—are not avoidable pathologies but rather manifestations of adaptive mechanisms never selected to operate for 70 or 80 years. The ethnographic evidence is stark: hunter-gatherers living under ancestral conditions show moderate signs of these same diseases past ages 60–70, regardless of adherence to "optimal health behaviors." What distinguishes this hypothesis from conventional evolutionary mismatch theory is its conclusion: we are not dealing with a modern design problem, but with biological systems deliberately operating beyond their evolved operational span. For the longevity-conscious reader, this repositions the fundamental question: not "how do I avoid disease?" but "how do I optimize function within inherent adaptive limits?"