What if you were told you carried a gene that increases your risk for Alzheimer's disease? And what if you were told this gene starts to do its damage not when you're old but when you're young? Brace yourself. Scientists know there is a strong genetic component to the development of late-onset Alzheimer's. In 1993, researchers discovered a gene known as ApoE4 carried by about a quarter of us that triples the risk for getting Alzheimer's... 
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