Sipping one type of java can lower your risk of Alzheimer's disease, related dementias and Parkinson's disease.

Whenever 27-year-old Nathan Kerr stops by the office of his 81-year-old mentor Frank Booth, Kerr often finds Booth running on a treadmill.

Then last week, a large study published in the journal Nature Medicine predicted the number of dementia cases will double to 1 million people a year by 2060 because of the aging p ...