Loss of This Sense May Increase Your Risk of Heart Failure, Study Finds

Those with a poor sense of smell had about a 30% higher risk of developing congestive heart failure than participants with a “good” sense of smell (those who scored at least an 11 or 12), the study found. Honglei Chen, M.D., Ph.D., the study’s lead author and a professor in the department of epidemiology and biostatistics at the Michigan State University College of Human Medicine, said in a statement that it’s still unclear as to whether a poor sense of smell may be contributing to the development of heart failure or merely predicted it.

So, how can loss of smell impact your heart failure risk? Previous data suggests that poor sense of smell is associated with thickening of the arteries and artery plaques, suggesting that smell loss may be a marker of atherosclerosis, the gradual buildup of plaque in the arteries and the underlying cause of cardiovascular disease, says Mariell Jessup, M.D., F.A.H.A., chief science and medical officer for the American Heart Association. “Further, when our sense of smell isn’t as strong, we might be more likely to make poor food choices that exacerbate existing risk factors, instead of choosing healthy, nutrient-dense foods.” This could contribute to cardiovascular disease over time, she explains.

As a failing sense of smell is strongly associated with aging, as is the syndrome of congestive heart failure (CHF), the most straightforward interpretation of these results is that some individuals age at a more rapid rate than others, says Richard Wright, M.D., board-certified cardiologist at Providence Saint John’s Health Center. “Such people might lose their sense of smell and cardiac function at a more rapid rate than do others, and hence the observed correlation of these two clinical conditions may simply be due to differential rates of aging—similar to the various ages at which gray hair appears,” he points out.

The bottom line

We know that as we age, our sense of smell might start to gradually decline, in part due to neurodegeneration, which is usually associated with diseases like dementia and Parkinson’s disease, says Dr. Jessup. “However, in this study of older adults, poor sense of smell was associated with heart failure, particularly among those who reported very good to excellent health at baseline. This asks… if loss of smell may be a marker of deteriorating health even before more traditional signs.” Still, these are very preliminary data, Dr. Jessup remarks.

We are continuously looking for validated and reliable early markers of disease, says Jonathan Fialkow, M.D., deputy director of clinical cardiology at Miami Cardiac & Vascular Institute, a part of Baptist Health. “If we can find a simple test like an olfactory [sense of smell] test and determine if the individual may be at risk for heart failure in the future, we may be able to offer lifestyle interventions or medical treatments to prevent heart failure,” he says.

The study is intriguing, but we need much more research before we should create actions based on this study, Dr. Fialkow notes. Specifically, “We need more studies and observations to determine how powerful olfactory impairment is compared to other risk factors for heart failure,” he adds.

Let this study be a reminder to have regular health check-ups and to report all abnormalities, even smell loss, to your physician, says Dr. Jessup. “You should always talk to your doctor if you experience sudden changes in your health. If you suddenly notice that your favorite scents aren’t as strong, or if you can’t smell at all, be sure to make an appointment to speak with your healthcare team and keep track of when any changes occurred and if you noticed any other symptoms as well,” she advises

Also, keep in mind that this study was conducted pre-COVID, so a loss of smell today could be due to other reasons, such as contracting the coronavirus. If you suddenly notice that your sense of smell has lessened or you can’t smell at all, it’s best to consult your physician, who may suggest testing for COVID-19 to rule out any infection.