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Individuals whose mother had alzheimer's disease, they had a phenomenal shrinkage or brain atrophy over those two years compared to the images of the other volunteers in the study. >> we're all getting older in this country, the whole country is getting much older at the moment. when people are worried this sort of thing, what should people be doing? do you look at mom and say does she have it, i have a higher risk? >> there are two important risks everyone has to know about. the obvious one is age. beginning at age 65, about 3% are at risk of getting alzheimer's disease. but, tom, with each f...

She, it happens. >> i'm glad you brought that up because that's the other side of this. when we say prevention, we mean a lot of things, if you have a relative with breast cancer, a first degree relative, even an aunt, your risk doubles, if you have a mother or sister, it's five times greater, so your screening has to be five times more vigilant. >> i'm aware of that in my own family. that hit home. >> really? >> thank you dr. siegl, it's a good study and exercise and diet just helps to lower that level of estrogen. >> we should all be doing it, anyway, and this is another reason. >> thank you...