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Beard

Hair on the chin, lower face and neck

  • 33 min read
  • 7 chapters
A portrait of a man with a beard holding a cane, "master yaqoub qamari sharifabadi Irani "
@nazanin · CC0

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Through Hair, Puberty and Adult

Attitudes toward beards have varied across history, shaped by cultural traditions and fashion trends. Several religions require or encourage the wearing of beards, and some societies have associated them with masculinity, virility, virtue, beauty, wisdom, strength, fertility, sexual prowess, and high social status. In contrast, in cultures where beards are uncommon or unfashionable, they may be linked with poor hygiene or eccentricity. Beards can also provide environmental benefits, including protection from cold weather and sun exposure.

Biology

The beard develops in human males during puberty. Beard growth is linked to stimulation of hair follicles in the area by dihydrotestosterone, which continues to affect beard growth after puberty. Dihydrotestosterone also promotes balding. Dihydrotestosterone is produced from testosterone, the levels of which vary with season. Beard growth rate is also genetic.

Evolution

Biologists characterize beards as a secondary sexual characteristic because they are (mostly) unique to one sex, yet do not play a direct role in reproduction. Charles Darwin first suggested a possible evolutionary explanation of beards in his work The Descent of Man, which hypothesized that the process of sexual selection may have led to beards. Modern biologists have reaffirmed the role of sexual selection in the evolution of beards.

Evolutionary psychology explanations for the existence of beards include signalling sexual maturity and signalling dominance by the increasing perceived size of jaws; clean-shaved faces are rated less dominant than bearded. Some scholars assert that it is not yet established whether the sexual selection leading to beards is rooted in attractiveness (inter-sexual selection) or dominance (intra-sexual selection). A beard can be explained as an indicator of a male's overall condition. The rate of facial hairiness appears to influence male attractiveness. The presence of a beard makes the male vulnerable in hand-to-hand fights (it provides an easy way to grab and hold the opponent's head), which is costly, so biologists have speculated that there must be other evolutionary benefits that outweigh that drawback. Excess testosterone evidenced by the beard may indicate mild immunosuppression, which may support spermatogenesis.

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