An Alzheimer's risk gene runs in families, according to Dr. Sudha  Seshadri of the Boston University School of Medicine.

But that doesn't mean you will get it if you have this gene.

ApoE4 is the Alzheimer's gene and about 20 to 25 percent of the population carries it.

But Dr. Seshadri believes  Alzheimer's involves another gene, or genes, interacting with ApoE4 which will trigger the disease.

Doctors still don't know how big a factor or risk for Alzheimer's ApoE4  really is…

Read If Parents Had Alzheimer's, Aging May Come Early

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