Alzheimer's disease could be detected up to 20 years before dementia symptoms start to show following a major breakthrough by scientists in the United States

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Researchers have linked a specific type of body fat to the abnormal proteins in the brain that are hallmarks of Alzheimer's disease up to 20 years before the earliest symptoms of dementia  appear, according to a study being presented today at the annual meeting of the Radiological Society of North America (RSNA).