Alzheimer's is perhaps the one disease that strikes even more fear in our hearts than cancer does. One in three people over the age of 80 will be its victim, and most of us sit back and hope we won't be one of them. According to the Alzheimer Society of Canada, twice as many women get Alzheimer's disease than men. To protect against Alzheimer's, eat a diet that is rich in flavonoids and antioxidants. Flavonoid-rich fruits include apples, blueberries, cranberries, and grapefruit. One study found that people who drank fruit and vegetable juices such as orange, apple, or tomato three times a week were less likely to develop Alzheimer's disease. Other studies show that the more flavonoids a person eats, the lower the likelihood of developing dementia.