For some diseases, such as breast cancer, there are active steps you can take to lower your risk. For diseases such as Parkinson's and Alzheimer's, other than healthy living and a great diet with lots of antioxidants and good exercise, there isn't a lot you can do, that we know at this time, to prevent the disease.
Read the complete post at http://www.mindingoureldersblogs.com/2008/07/new-law-should-protect-those-who-want-genetic-tests-will-it.html