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We often judge potential friends based on first impressions – a smile, a handshake, the way someone speaks. But new research suggests an often-overlooked sense plays a surprisingly powerful role in determining who we click with: smell.
A study published in the journal Scientific Reports found that our “diplomatic odor” – the unique blend of scents from our daily lives, including personal care products, diet, pets, and environment – significantly influences how we perceive potential friends, even more so than visual cues.
Researchers led by Jessica Gaby, an assistant professor of psychology at Middle Tennessee State University (MTSU), moved beyond previous studies focused on natural body odor to investigate this complex everyday scent profile. “It’s not just perfume,” explained Professor Gaby. “It’s your dietary choices. Are you a cat person or dog person? What laundry detergent do you use?”
The study aimed to understand how this diplomatic odor impacts platonic friendship potential, a crucial aspect of our social landscape that affects mental and physical well-being.
Testing Scent in a Social Setting
The researchers organized a speed-friending event with 40 women. Participants wore clean cotton T-shirts for about 12 hours during their normal daily activities, avoiding only smoking and alcohol, and using their regular personal products.
Before meeting face-to-face, participants smelled the worn T-shirts in a controlled setting designed to mimic a busy room. They rated how likely they would be to hang out with, befriend, or avoid the shirt’s wearer based solely on the scent. These initial ratings already showed distinct personal preferences – what smelled appealing to one person didn’t necessarily appeal to another.
Next, the women participated in a series of brief, four-minute conversations with several other participants. After each chat, they again rated their partner’s friendship potential.
Scent as a Powerful Predictor
The results were striking. The friendship ratings based on the initial T-shirt sniff test closely predicted the ratings given after the live, face-to-face interactions.
“People take a lot in when they’re meeting face to face. But scent, which people are registering at some level, though probably not consciously, forecasts whether you end up liking this person,” said Vivian Zayas, professor of psychology at Cornell University and co-author of the study.
Even when compared to impressions formed from briefly viewing photographs (100 milliseconds per image), the scent-based judgments proved to be a stronger and more consistent predictor of post-interaction feelings. Statistical analysis confirmed that diplomatic odor had a more significant impact than these quick visual assessments.
Interactions Can Change How Things Smell
Intriguingly, the study also found that the social interaction itself could change how a scent was perceived. When participants re-smelled the T-shirts after the speed-friending chats, their opinions often shifted. A positive interaction tended to make the associated T-shirt smell better, while a disappointing chat could make the same scent seem less appealing.
“It makes sense to me that the way you smell impacts the way I judge you,” Gaby commented. “But I was most surprised by the learning, by the shift in the second set of readings – one interaction and you’re like, hmmm, maybe not.” This suggests our brains rapidly update scent associations based on social experiences.
Idiosyncratic Tastes and Social Chemistry
A key theme was the individuality of scent preference. “Everybody showed they had a consistent signature of what they liked,” Zayas noted. “And the consistency was not that in the group one person smelled really bad and one person smelled really good. No, it was idiosyncratic.” This suggests that ‘social chemistry’ might involve aligning not just interests, but perhaps also subtle scent preferences shaped by lifestyle choices reflected in our diplomatic odor.
Conducted in a realistic, bustling environment rather than a sterile lab, the study highlights that even amidst competing sensory information, our sense of smell quietly but powerfully guides our initial social judgments, shaping the foundations of potential friendships.
Disclaimer: This article summarizes findings from a specific scientific study published in Scientific Reports. Individual experiences with social interactions and the role of scent may vary. This information is for general knowledge and does not constitute personal advice.
