There is probably no disease that is as scary as Alzheimer's. A study done on 5,000 Dutch men and women offers real hope for avoiding the disease. It tracked men and women whose average age was 67. Those who ate 4 ounces of fish (which is one serving a week) had a 70% lower rate of Alzheimer's than the non-fish eaters. The theory as to why these results occurred is because of something called Omega-3 fatty acids which have anti-inflammatory properties.
You can simply eat one serving of fish (cold water fish are best, e.g. salmon) per week or include Omega-3 supplements in your diet.