Here it is!! Fasting 2 days per week may prevent Alzheimer’s Disease, Obesity, Cancer and Diabetes. Fasting two or more days a week is catching on as people seek ways to avoid a range of ailments linked to obesity from dementia to cancer. Building on promising findings in studies of mice by the U.S. National Institute of Aging, researchers are planning the first studies in humans of fasting’s potential to stave off the onset of Alzheimer’s. That disease is just one of many in which scientists are making progress understanding how fasting may help prevent illness.