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Poor Sense Of Smell Could Be Early Sign Of Parkinson’s

When it comes to our five senses, our ability to smell usually gets forgotten unless we come into contact with something especially unpleasant. However, new research suggests this underappreciated sense, or rather an impairment of it, could be used to help identify Parkinson’s disease in patients up to 10 years before symptoms, such as trembling and stiffness, develop.

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In a study now published online in Neurology, researchers said they’ve designed a test that may help to measure someone’s sense of smell, which could then lead to earlier diagnosis and treatment. In tests, they discovered the link between poor smell and Parkinson’s was also greater in men, though they don’t know why. Parkinson’s is a neurodegenerative brain disease with no cure, and we’re also not sure what causes it, according to the National Parkinson’s Foundation.

“Earlier studies had shown prediction of Parkinson’s disease about four to five years after the smell test was taken,” said study author Honglei Chen in a recent statement. “Our study shows that this test may be able to inform the risk much earlier than that.”

For the research, the team looked at 2,462 people with an average age of 75 who took a scratch and sniff test where they were asked to identify common scents such as lemon, gasoline, onion, and cinnamon, Healthline reported. The volunteers were then followed for an average of 10 years.


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