for six species of bacteria that can make people sick. Then they related the presence or absence of these bacteria to certain body measurements. No one actually rated how attractive each volunteer was. Instead,
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, the researchers used the volunteers’ self-reported height and weight (combined as body mass index,
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, or BMI), plus measurements of the women’s waist-to-hip ratios, as a measure of attractiveness. A normal-range BMI (neither underweight or overweight) is usually rated as more attractive in both men and women,
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, as is a smaller waist-to-hip ratio in women, which gives an hourglass shape with a smaller waist than hips.
The researchers’ hypothesis was that more attractive people would carry fewer nose germs. Body measurements that affect attractiveness are “honest signals of biological quality,
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,” they argue,
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, so “people with more attractive values of these traits should be more immunologically competent.” In other words,
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, attractive people are also healthier people,
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, who should have better immune systems that fight off nasal pathogens.
But the results were different for men and women. Women in the study with the more attractive low waist-to-hip ratios were actually more likely to be colonized by pathogens. But men whose noses were colonized by the pathogens had higher BMI values on average,
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, and that’s the result that was promoted in a press release and ultimately drew media attention.
It’s an interesting idea, worth exploring in the context of how accurately humans can discern the health of others. It makes sense that we’ve evolved to pick up

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