A study in Journal of Cellular Biochemistry found evidence to suggest that cocoa powder renders a neuroprotective and preventive effect against Alzheimer's disease.  The study led by Antonio Giordano from Temple University, Philadelphia, PA and colleagues shows that cocoa polyphenols trigger neuroprotection against Alzheimer's disease by activating BDNF survival pathway.  An estimated 5 million Americans live with Alzheimer's disease, which has no cure and eventually completely disable and kill the patients. (reporting by Jimmy Downs)