Researchers at Michigan State University have found evidence that a simple scratch-and-sniff test could identify certain people who are at an increased risk of developing the disease up to 10 years before they are actually diagnosed. Previous research has shown an association between sense of smell and disease progression of up to four to five years. The federally funded study, now published online in Neurology, the official publication of the American Academy of Neurology, is also one of the first to follow black people. It found that older men with a poor sense of smell were more likely to develop the disease compared to women. Also, people with poor sense of smell were nearly five times more likely to develop the disease than people with a good sense of smell.