Why do some people have more body hair than others?
Quick Answer
Body hair depends on genetics, hormone levels, age, and ethnicity-related variation in hair follicle sensitivity. Hair follicles respond differently to androgens, which is why hair growth patterns vary so much.
The Full Story
Human body hair is influenced by how follicles respond to hormones, especially androgens such as testosterone and dihydrotestosterone. Genetics affects both the number of visible follicles and how sensitive they are to hormonal signals. This is why some people grow much denser chest, arm, or leg hair than others, and why patterns can differ between sexes and populations. Age also matters: hair distribution often changes through puberty and later adulthood. Body hair serves limited insulation and sensory roles, though in humans it is much less dense than in many other mammals.
Key Facts
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"Why do some people turn hairy in puberty while others stay nearly hairless?"
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