Loss of Smell Linked to Increased Risk of Death
A 13-year investigation at Michigan State University that involved more than 2,000 people aged 71 to 82 found that the folks who had trouble detecting odors had a 50 percent greater chance of dying within ten years.2 Michigan State researcher Honglei Chen, MD, PhD, warns that, "Poor sense of smell becomes more common as people age, and there's a link to a higher risk for death.” Dr. Chen notes that a weak sense of smell can be an early indicator of Parkinson’s disease and Alzheimer’s disease, as well as other forms of dementia. But in his study, those conditions only accounted for 28 percent of the increased risk. And he can’t explain what other factors are involved. "We don't have a reason for more than 70 percent of the increased risk," says Dr. Chen. "It tells us that in older adults, impaired sense of smell has broader implications of health beyond what we have already known. Incorporating a sense of smell screening in routine doctor visits might be a good idea at some point."Losing Your Smell to COVID
You’ve heard – or perhaps experienced first-hand – that a COVID-19 infection can steal your sense of smell, at least temporarily. Exactly why this happens has not been definitively explained, but research at Johns Hopkins indicates that inflammation linked to the disease is the cause. The loss of smell doesn’t come directly from infection of the nose or brain by the virus.3 “Our findings suggest that SARS-CoV-2 infection of the olfactory epithelium leads to inflammation, which in turn, damages the neurons, reduces the numbers of axons available to send signals to the brain and results in the olfactory bulb becoming dysfunctional,” says Hopkins researcher Cheng-Ying Ho, MD, PhD.Restoring Sense of Smell
Meanwhile, research is underway to find ways to restore a sense of smell in folks who have lost it. Researchers at Tufts have developed a way to grow and maintain olfactory stem cells which might be used to restore odor-sensing tissues in the nose for people who have lost those types of cells. At the same time, collaborations between researchers at the Harvard Medical School and Virginia Commonwealth School of Medicine are ongoing to create brain implants to help people with brain injuries detect odors. None of that research, unfortunately, seems close to yielding tangible results. So, if you have a dependable sense of smell then you should treasure it and pay attention to any changes to your sniffer. But if it starts to slip, beware. You may want to get a thorough medical checkup to see if a serious medical condition is threatening your health.Meet
The Expert:
The Expert:
Susan Clark is an award-winning, Emmy-nominated journalist and author who has written about nutrition, health, and wellness for 27 years. She has developed content for articles, reports, books, videos, and television news segments featuring some of today’s top alternative and integrative doctors. She earned a bachelor of science in broadcast journalism from Texas Christian University. She lives in Los Angeles with her husband, two sons, and numerous pets.