A new study suggests Alzheimer 's may be the third-leading U.S. cause of death . The Alzheimer's Association says it is not yet clear whether a link exists between dementia and obesity or other risk factors for developing dementia. The study followed 2,500 patients for 8 years ; 400 died of Alzheimer 's . Advocates hope the findings will build support for more research .
A new study suggests Alzheimer 's may be the third-leading U.S. cause of death . Current figures are `` a gross undercount , '' Alzheimer 's Association says . The study followed 2,500 patients for 8 years ; 400 died of Alzheimer 's . Advocates hope the findings will build support for more research .