A number of studies have found that a poor sense of smell in older adults is linked to health problems (especially Parkinson's disease and dementia) and death. Now a recent study found that a poor sense of smell in older adults is associated with an almost 50% increase in their risk of dying within 10 years—especially in individuals reporting good health. In other words, a poor sense of smell is an early sign of deteriorating health, even when it is not apparent yet to the person.
Researchers at the Michigan State Univ. College of Human Medicine followed 2,289 persons (aged 71 to 82) for 13 years. The generally healthy persons took a smell test of 12 common odors (e.g. onion, soap, gasoline, lemon, chocolate and rose) at the start of the study, and were scored as having good, moderate, or poor sense of smell. After 13 years 1,211 of them had died. The researchers then looked to see if there was any association between scores on the smell test and their risk of death at various points over the 13 years.
No association was found at the three- or five-year mark of the study. But those with a poor sense of smell had a 46 percent higher risk of dying by 10 years and a 30 percent higher risk by 13 years, when compared with the older adults with a good sense of smell. The researchers believe the risk was lower at 13 years because so many of the participants had already died - whether their ability to smell was initially good or poor. So how to interpret the study results? It appears that a poor sense of smell may be a sensitive early sign of deteriorating health, even when it is not apparent yet.
From Medical Xpress: Poor sense of smell associated with nearly 50 percent higher risk for death in 10 years ...continue reading "Is A Poor Sense of Smell In Older Adults A Sign of Deteriorating Health?"
A benefit (perhaps) of having the appendix taken out in childhood - it is associated with a lower rate of Parkinson's disease decades later in life, according to an international study that looked at health records of 1.7 million people in Sweden. Other main findings is that this finding is especially strong for individuals living in rural areas (and not urban areas), and that removing the appendix also delayed the age of Parkinson's disease onset in those who got the disease. But if you read further, there were other interesting findings in the study, even though much is still unknown - it's still a big puzzle with lots of pieces still to be filled in.
By the way, other recent research also supports the view that Parkinson's disease gets its start in the gut - and not in the brain, which is what everyone thought for years. But note that there are other risk factors such as certain pesticide exposure or drug use, or trauma to the head that are linked to Parkinson's disease. Many studies find that rural living is associated with a higher risk for Parkinson's disease, and it is thought this is probably due to higher exposure to pesticides, which then somehow contributes to the development of Parkinson's disease. From Medical Xpress:
Appendix removal is linked to lower risk of Parkinson's
Scientists have found a new clue that Parkinson's disease may get its start not in the brain but in the gut—maybe in the appendix. People who had their appendix removed early in life had a lower risk of getting the tremor-inducing brain disease decades later, researchers reported Wednesday.
Why? A peek at surgically removed appendix tissue shows this tiny organ, often considered useless, seems to be a storage depot for an abnormal protein—one that, if it somehow makes its way into the brain, becomes a hallmark of Parkinson's. ...continue reading "Appendix Removal and Parkinson’s Disease"