Strong Sense of Smell May Be Linked to Longer LifeSkill Level 7, Published on: May 15, 2019
Older adults with a poor sense of smell may die sooner than those who have a better sense of smell, a new study suggests.
The study was a project of researchers in the United States that was ongoing for over 13 years. They asked nearly 2,300 men and women to identify 12 common smells. All the subjects were from 71 to 82 years of age.
The researchers gave the adults scores, from zero to as high as 12, based on how many smells they identified correctly. During 13 years of follow-up investigation, over 1,200 of the subjects died.
When the study was launched, none of the adults were weak. They could walk a little under half a kilometer, climb 10 steps and independently complete daily activities.
In the latest findings, the researchers noted that those with a weak nose were 30 percent more likely to die by year 13 than people with a good sense of smell. The findings were reported last month in the scientific publication Annals of Internal Medicine.
Honglei Chen was the lead writer of a report on the study. He is a doctor with Michigan State University in East Lansing, Michigan.
Chen said the connection between a poor sense of smell and an increased risk of dying was limited to adults who first reported good-to-excellent health. This suggests that a poor sense of smell is an early and sensitive sign for worsening health before it is recognizable in medical tests.
“Poor sense of smell is likely an important health marker in older adults beyond what we have already known about,” noted Chen. He was talking about links to memory loss through dementia, Parkinson’s disease, a poor diet and safety risks.
People who started out the study in excellent or good health were 62 percent more likely to die by year 10 if they had a poor sense of smell, his team reported. But smell did not appear to make a meaningful difference in death rates for people who were in fair to poor health at the start of the study.
With a poor sense of smell, people were more likely to die of brain and heart diseases, but not of cancer or breathing disorders.
The results also suggest that a poor sense of smell may be an early warning for poor health in older age that goes beyond dementia or other neurodegenerative diseases. These often signal the beginning of a weakening of the mind or body.
Dementia and Parkinson’s disease explained only 22 percent of the higher death risk tied to a poor sense of smell. Weight loss explained just six percent of this connection, researchers estimated. That leaves more than 70 percent of the higher mortality rates tied to a weak nose unexplained.
The connection between a poor sense of smell and mortality risk did not appear to change based on sex or race. It also did not change based on individuals’ other qualities, such as the way they live or ongoing health conditions.
One limitation of the study is that the older adults were relatively active. This makes it possible that results might be different for younger people or for individuals who are weak, the study noted.
Read the following vocabulary with your teacher.
score(s) – n. the number of points that someone gets for correct answers on a test or exam
beyond – prep. more than something
neurodegenerative – adj. causing the brain or nerves to become weaker or less able to function as time passes
mortality – n. the death of a person or animal
Answer these questions about the article.
1. How many subjects were included in the study?
2. Who was the lead writer of a report on the study?
3. What is weak sense of smell related to, according to Dr Chen?
4. Would the results of the study be the same if the participants were younger?
Make a sentence.
Make sentences using these words.
score, beyond, mortality
Have a discussion on following questions.
1. What d you think of this study?
2. Are you surprised by the findings of the study?
3. Would you say you have a strong sense of smell?
4. What are some of your favorite / least favorite smells?
5. Is there a particular smell that reminds you of your childhood?