As girls go through puberty, their hormones will have a direct impact on how their facial features develop. Women with high levels of estrogen will end up with full lips and a large waist-to-hip ratio, while women with lower levels of androgen, the steroid hormones, will keep their short and narrow jaws from childhood, along with their flatter brows – giving them much larger eyes. And – surprise, surprise – this balance of female hormones is also positively linked to fertility.
-Hannah Fry
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