[Great on burgers too]
"The study, by the Mayo Clinic, found that seven known risk factors contribute to up to half of Alzheimer's cases worldwide. For Americans, the single biggest risk factor is physical inactivity, which the study linked to 21 percent of U.S. Alzheimer's cases.Depression accounts for another 15 percent, and smoking for 11 percent. Globally, lack of education is the greatest risk factor, with a link to 19 percent of cases; scientists say minds that are not active and engaged in learning are more susceptible to the disease.The findings contradict the widespread belief that Alzheimer's is a predetermined genetic fate."
Which means that Alzheimer's is caused by couches and spreads from the toukes to the brain.