We now have such tools as neuroimaging and genome-wide scans that hunt for genes related to risk, as well as big samples of people who've been followed over time.

The ability to do relevant research on Alzheimer's disease has changed enormously in just the past couple of decades.

'This offers interesting insight but we need to turn it now into clinical trials, ' says the former director of the Office of Alzheimer's Disease Research at the National Institutes of Health.

Memory loss caused by Alzheimer's Disease could be reversed after scientists discovered that a chemical naturally produced by the body to fight arthritis also works on the brain condition.

People need to be careful not to overstate what we know about preventing Alzheimer's disease.