There is a wealth of psychological and biological information stored in our scent, but for some reason we choose to ignore it.

King Louis XIV of France was obsessed with fragrance. Cut flowers adorned every room in Versailles, furniture and fountains were sprayed with perfume and visitors were even doused before entering the palace. Whether it was because his personal hygiene was not up to the standards we might expect today, or he just enjoyed playing with scent, Louis understood that smell is important.

Our body odour can reveal details about our health, like the presence of diseases (cholera smells sweet and acute diabetes like rotten apples). “It can also reveal information about our diet,” says Mehmet Mahmut, an olfaction and odour psychologist at Macquarie University, Australia. “There are a couple of studies that kind of contradict, but my group found that the more meat you consume the more pleasant your BO smells.”

Men find women’s body odour more pleasant and attractive during the follicular phase of the menstrual cycle, when women are most fertile, and least pleasant and attractive during menstruation. This might have been useful for our ancient ancestors to detect good candidates for reproduction, suggest the authors of that paper. Men’s testosterone levels might improve their scent, too.

While it can change depending on our diet and health, a lot of what makes our smell unique is determined by our genetics. Our body odour is specific enough, and our sense of smell accurate enough, that people can pair the sweaty T-shirts of identical twins from a group of strangers’ T-shirts. Identical twin body odour is so similar that matchers in this experiment even mistook duplicate T-shirts from the same individual as two twin T-shirts.

For read the full text click here:

https://www.bbc.com/future/article/20210621-why-single-people-smell-different

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