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Why does estrogen make my brown eyes blue? Sex linkage of hair and eye colors
(peterfrost.substack.com)
It’s pretty interesting study, but also a kind of dense long read:
TL;DR: This article explores how estrogen influences hair and eye color development, showing that women more often have non-black hair (like red and blond) and non-brown eyes (like blue, green, hazel). These traits, once rare, have become more common due to their attention-grabbing qualities and are linked to feminization in men and shyness in blue-eyed boys. The article argues this diversity began in European women, with men inheriting these traits as a side effect. It also discusses a proposed study to further investigate the hormonal influence on these traits and their associated behavioral/physical characteristics.