The biology of body odour, from sweat glands to skin bacteria

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Sweat rarely smells on its own. Body odour develops when bacteria on the skin break down compounds in sweat and release volatile chemicals that evaporate into the air.

This interaction between sweat and microbes explains why some areas of the body smell more strongly than others, why odour varies between people and how deodorants and antiperspirants reduce it.

Sweat is a clear, salty liquid produced by glands across almost the entire surface of the skin.