The University of Michigan completed a long-term experiment to identify signs of dementia in the earliest stages. The state of the body, when there are no usual alarming symptoms at all, and the disease is already progressing, can be calculated by the selective loss of smell. For example, if a person suddenly stops smelling gasoline or soap.
The study lasted 10 years, much longer than similar programs, which made it possible to find subtle patterns that develop very slowly. In the mixed racial group, there were 2, 462 middle-aged to senior citizens. All of them were regularly forced to undergo tests to identify Parkinson's by medical methods, as well as to take tests for smell.
The test subjects had to sniff not exotic aromas, but 12 common smells, from cinnamon and lemon to gasoline and soap. And give your assessment of the intensity of the aroma, from weak to strong. Later, by the end of the experiment, 42 patients were officially diagnosed with Parkinson's disease using tested markers - all of them had a very weakened scent throughout the experiment. More precisely, the analysis of statistics gave the following result: at the beginning of the study, people with a weak sense of smell at the beginning of the study had a 5 times higher chance of getting dementia than their colleagues with a normal sense of smell.
The scientists insist that they corrected the data and took into account such factors influencing the sense of smell as smoking, head injuries and personal mental disorders. It should be noted that this study is fundamental, and specific tests to determine the signs of Parkinson's disease based on the state of a person's sense of smell have not yet been developed.