Humans' sense of smell may indeed be gradually fading, according to a study that has found people carry different versions of two scent receptors for musk and body odor.
Olfactory receptors detect airborne chemicals that waft into our noses, but smell receptors vary immensely from one person to the next.of their odorant receptor genes, a 2013 study found. Which explains why some people might find some smells pungent or pleasant that the next person can't even detect.
Participants rated the intensity and pleasantness of the odors on a 100-point scale, and the researchers looked at genetic variation in their olfactory genes, hoping to find changes linked to how people perceive scents. Mutations in the genes encoding these receptors affected whether people perceived the scents as stronger or less intense, but genetics only explains a small part of the difference.
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