Why Your Genes Matter More Than Ever (And What That Actually Means)
New research shows heritability of human lifespan has doubled from 25% to 50%—not because genes changed, but because modern medicine and living standards have leveled the environmental playing field. When basic survival factors like clean water, food, and healthcare become universal in developed countries, genetic variation emerges as a more visible factor in longevity differences. Understanding this shift changes how we should think about our own healthspan and what we can actually control.
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