Yet another reason to watch one's weight: a new study says that it could cut future risk of dementia by as much as 20%. There is a strong correlation, says May Beydoun, postdoctoral research fellow at Johns Hopkins University's Bloomberg School of Public Health and co-author of the study. The study reviewed 10 previously published reports on dementia and obesity. Beydoun and co-author Youfa Wang, assistant professor of international health, found the incidence of dementia to be 20% higher among obese adults. Incidence of Alzheimer's disease, the most common form of dementia, was 80% higher. Beydoun hopes that this study will help raise awareness of the long-term rates of obesity.