Can Smelling Sweat Of A Happy Person Make You Happy Too?

A study published in the journal Psychological Science found that we can actually smell the happiness in the sweat of happy people.

Have you ever been around someone who seems to just exude happiness? Maybe they have a contagious laugh or a perpetual smile, but what if it was their sweat that was seemingly infecting you with their happiness?

A study published in the journal Psychological Science backs up this unusual claim.

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Sweating Happiness

Studies have suggested that our body odors can reveal certain information about our health and emotions. Studies have reported that when people smell the sweat of someone who is scared, their own facial muscles react with fear, more so than when they smell sweat from someone who is having a normal experience.

So, can we feel happy by simply smelling the sweat of a happy person?

To answer this, researchers from the Netherlands and the United Kingdom recruited 12 men to watch three videos, chosen to make the participants feel fear, happiness, or a neutral reaction. After every video, they swabbed the underarm sweat of the men. The men also completed a survey of their emotional states during and after the videos.

A group of 36 women were then made to smell the various collected sweat samples. Women were chosen as the ‘sniffer’ group, as they are thought to have a greater sensitivity to smell and emotional cues from the opposite sex.

When the sniffing participants smelled sweat produced during the scary video, they displayed more facial activity in the medial frontalis muscle, a key component of fear expressions. Meanwhile, when they smelled the sweat produced during the positive video, the women displayed more facial muscle activity common to the “Duchenne” smile, a component of happiness expressions.

The evidence, the researchers suggest, depicts ‘behavioral synchronization’ between the sender and receiver. When looked at from this point of view, emotional signals in our sweat may serve an evolutionary purpose.

Since the chemosignals of fear might serve to warn others, similarly, the chemosignals of a positive emotional state might facilitate bonding between individuals.

What Are These Chemosignals?

We don’t know what all the chemosignals are that affect our behavior, but the authors of the study primarily suggest the hormone adrenaline.

Our armpit sweat glands have receptors for adrenaline, a hormone produced when we experience intense stress or excitement. The body releases adrenaline as a result of excitement, both negative (fear or stress) and positive (euphoria). Since the glands can sense the release of adrenaline, they begin to produce more sweat.

An author of the study, Dr. Jasper Groot, says to the HuffPost, “Eventually these odors could have become associated with happiness-related or fear-related information in the environment — such as facial expressions or sounds — co-present during odor release,” Groot continued. “The odors could have become signals through learning.”

How Could We Benefit From This?

The obvious benefit relates to perfume. Don’t worry, no one will be selling sweat perfume, but if researchers can identify the molecules in the sweat that make us feel pleasant, that is something perfumers can use for all of our benefit. Interestingly, some researchers were associated  with Unilever’s research and development department.

Less vanity related would be using sweat as a diagnostic tool. As we mentioned at the start of the article, sweat also contains molecules that can tell us about certain health conditions. For example, sweat could allow us to diagnose stress or anxiety disorders.

These are just a few use cases. The current study is just a single piece of evidence that could lead to some of the above, all of the above, or none of the above. Either way, the potential is fascinating!

Conclusion

However, before we can make any products or tools, we need to acknowledge a few caveats.

It’s possible that the strength of the effect depends on the relationship between the smeller and the person whose sweat they are smelling. Smelling the sweat of a stranger might not have the same effect as smelling the sweat of a close friend or romantic partner.

Happiness, or any emotion, tends to be a subjective experience. What makes one person happy may not have the same effect on another person. Also, we don’t all have the same nose. Individuals have different olfactory sensitivities and past experiences with certain smells. Smells hold powerful memories, and in the brain, smells excite the hippocampus (related to memory) and amygdala (emotion) rapidly and frequently. Differentiating all those variables would be complicated to say the least.

If researchers do pinpoint what “happy sweat” is made from, perhaps sweat perfume will become the new trend!