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Does everyone have a personal smell?

Everyone has their own scent—just think of how differently your grandma and your boyfriend smell when you lean in for a hug. But can we smell ourselves? For the first time, scientists show that yes, we can, ScienceNOW reports. Our basis of self-smell originates in molecules similar to those animals use to chose mates.

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Everyone has their own scent—just think of how differently your grandma and your boyfriend smell when you lean in for a hug. But can we smell ourselves? For the first time, scientists show that yes, we can, ScienceNOW reports. Our basis of self-smell originates in molecules similar to those animals use to chose mates. Humans use these molecules, called histocompatibility complex proteins, to help differentiate between people and between our own cells and invading pathogens. These peptides were featured in the now-famous “smelly T-shirt” experiment in which researchers asked women to sniffed men’s worn shirts and identify which they preferred. The women tended to select the men’s scents that least like their own smells. But that experiment didn’t reveal how people react to their own smell or even whether they could recognize it. In this latest experiment, biologists tested whether women can recognize lab-made proteins resembling their own. After taking a shower, the researchers asked the women to apply two different solutions to their armpits and decide which smell they liked better. Women who were nonsmokers and who did not have a cold preferred the solution closest to their own scent. Next, the biologist used fMRI to measure brain changes in women while they smelled various solutions. Again, the women responded differently to the self and non-self smells. A particular region of the brain activated only when the women’s “self” peptides came into contact with their nose. These findings may explain how we choose a perfume or cologne. People might select a scent that amplifies their own peptides’ smell, while still being able to appreciate other scents on other people. Chanel No. 5 may mesh well with your own body odor, while your best friend may be better suited for patchouli oil.

More from Smithsonian.com:

The First Major Museum Show to Focus on Scent

Why Do Flowers Smell Good?

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Why do I have a metallic body odor?

Sometimes such smells can be caused by certain medications or handling or wearing metallic objects. In addition, eating foods such as onions, garlic and strong spices may produce odors not previously noticed prior to puberty.

Expert answer

Thanks for your question and I'm sorry to hear about your daughter's issue. Adolescents definitely go through many changes during puberty. Body odors in particular may be caused by an increase in skin oils or sweat coming into contact with dirt, bacteria or dried blood. Soap, laundry detergent, makeup, lotions and other products can also create pungent smells. Sometimes such smells can be caused by certain medications or handling or wearing metallic objects. In addition, eating foods such as onions, garlic and strong spices may produce odors not previously noticed prior to puberty.

Is it possible to tell whether the odor is coming from a certain part of the body (nose, mouth, hands, feet, or armpits for example) or from the skin in general? Could it be related to her menstrual cycles?

Does she have any dental appliances in her mouth? Is she wearing certain sports articles regularly (shin guards, etc.) that may be the culprit?

Rarely odors may be a sign of a metabolic disorder or other imbalance, in which case blood or urine tests may be needed. It may be helpful to have your daughter checked out by her pediatrician to rule out a medical cause for the odor. The doctor may recommend certain antibacterial cleansers or antiperspirants in addition to regular bathing and laundering clothes as well as any medical treatment if necessary. I hope readers will share their advice for dealing with this type of situation in the comment area below. Good luck!

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