Your Life
There’s something so wonderfully nostalgic about smelling certain foods cooking or baking that takes me back to beloved memories. My daughter now wears my favorite perfume because it reminds her of me—especially now that she lives in her own home. The scientific community has studied the connections between smell, memory, and health for years. One of the first studies exploring the links between odor and memory was published in 1935.
Now in current times, scientists continue to make strides in understanding the connection and even harnessing it to improve health. “It’s now clear that even though our sense of smell is not as robust as that of a mouse or bloodhound, it is deeply tied to our cognitive centers, our emotional centers, and our memory centers,” says Sandeep Robert Datta, a professor of neurobiology at Harvard Medical School. “We’re dependent on it for a sense of well-being and centeredness in the world.” Rachel Herz, a neuroscientist from Brown University, further extrapolates, “Smell can instantly trigger an emotional response along with a memory, and our emotional states have a very strong effect on our physical well-being.”
In addition to citing myriad studies that link smell-induced memories to mood improvement and stress reduction, Herz points to research showing that smells that evoke personal memories promote slower, deeper breathing than pleasant but more generic smells and linking odor-evoked memories to significant reductions in markers of inflammation. These beneficial effects may explain why the loss of olfaction — a condition called anosmia — can be damaging to mental health. “If we are suddenly denied our sense of smell, we feel adrift and confused about where we are in a way we didn’t expect,” says Datta. “We’re constantly being reminded about where we’ve been and where we are through our sense of smell.” Of course, not all smells evoke good memories. Certain smells can also trigger trauma for others who associate it with bad memories. My husband hates the smell of hospital antiseptic because it reminds him of his chemo treatments.
Scientists are still exploring whether scents might help spur lost recollections in people with dementia, ALZ and other conditions causing memory loss. While the concept of “reminiscence therapy” using smell is relatively new and untested, it’s already being used in some hospitals and care facilities.
The Connections Between Smell, Memory, and Health
by Molly McDonough
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