WebMD -- Dec. 13, 2010 -- Having higher HDL, or “good” cholesterol, may reduce the risk of Alzheimer’s disease, new research suggests. Experts say the new study, which was published Monday in the Archives of Neurology, is further evidence of a link between heart disease and dementia, and if the finding is backed by more research, doctors think it may point to a way that people can reduce their risk of both brain and heart trouble later in life, by boosting HDL.