Evolution of Human Skin Pigmentation
As humans journeyed beyond Africa, their skin tones lightened gradually. This adaptation arose from the interplay of biology and environment: in regions with reduced sunlight, lighter skin facilitated better vitamin D synthesis crucial for bone health. Meanwhile, those in sunnier climes boasted richer melanin levels, providing superior UV protection.
The agricultural revolution brought dietary shifts, potentially reducing vitamin D intake. Lighter skin, it’s theorized, evolved to compensate for this deficiency, optimizing vitamin D production. This tale of adaptation and survival underscores the profound impact of environmental factors on human evolution.