Raise a glass of the good stuff. In a 2006 University of South Florida study, people who drank three or more 4-ounce glasses of fruit or vegetable juice each week were 76 percent less likely to develop Alzheimer’s disease than those who drank less. The high levels of polyphenols—antioxidants found in fruits and vegetables—may protect brain cells from the damage that may be caused by the disease, says study author Amy Borenstein, Ph.D.