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Why single people smell different

King Louis XIV of France was obsessed with fragrance. Cut flowers adorned every room in Ver’sailles, 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 an olfaction and odour psychologist from 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 body odour 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.

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