Did you think you would express the love you have for your partner through a fiery kiss? Know that this is not the only thing you share. You could also convey… a little of your depression.
When the oral microbiota influences mood
According to a new study published in the journal Experimental Results in Health and Medicineregularly kissing your partner could modify the oral microbiota. And, therefore… mental health. Because these bacteria directly influence brain activity. They could even play a role in the transmission of disorders such as anxiety, depression or insomnia.
To arrive at these conclusions, the researchers studied couples who had lived together for several months. They found that partners who kiss frequently tend to develop a similar oral microbiota. However, when one of the two suffers from mental disorders, the other often presents an altered bacterial composition, accompanied by similar first emotional signs. “The link is statistically significant”specifies the scientific report. The hypothesis: certain bacteria exchanged via saliva could alter the production of neurotransmitters linked to mood, such as serotonin or dopamine.
When saliva becomes an invisible vector of emotions
Small “kitchen” detour: a simple kiss could exchange up to 80 million bacteria in ten seconds. These micro-organisms, far from being harmless, can integrate into each other’s microbiota, modifying the oral flora and, by extension, the mouth-brain axis – still poorly understood but now at the heart of scientific research.
According to the site New Atlasthis microbial transmission would more strongly affect couples living under the same roof, particularly when one shows signs of stress or mental fatigue. “The oral microbiota influences the way the body regulates stress hormones”explain the researchers. Thus, a kiss could become a real emotional vector, with subtle, delayed, but measurable effects.
The study also reveals that this phenomenon is not limited to severe mental disorders. Mild imbalances such as poor sleep, intrusive thoughts or irritability could also be transmitted via this shared microbiota. Fortunately, conversely, a balanced and diverse microbial ecosystem would act as a protective factor.
A discovery that shakes up our vision of couple relationships
So of course, you may not want to associate languorous kisses and bacterial microbiota in your mind. But beyond the anecdote that will hit the mark at a dinner, this study raises an essential question: could the mouth be a key interface in our emotional balance? Our intimate habits influence, on a daily basis, our psychological well-being.
According to the researchers, this still emerging field could open the way to targeted therapies using bacterial modulation, or even to taking the microbiota into account in therapeutic support for couples. But rest assured: it’s not about stopping kissing! On the contrary, the study underlines that these exchanges also strengthen immunity, make it possible to share beneficial flora and promote a form of biological synchronization between partners.
A real moment of sharing, in every sense of the word.