The major risk factors are age and family history, a serious head injury.
Scientists believe that genetic factors may also be involved.
A protein called apolipoprotein E (ApoE) may be important.
Everyone has ApoE.
However, the function of ApoE in the brain is less understood.
One form seems to protect a person from AD, and another form seems to make a person more likely to develop the disease.
Scientists have found aluminum, zinc, and other metals in the brain tissue of people with Alzheimers.
Some scientists think that a virus may cause AD.
Alzheimers is most likely to be several factors that act differently in each person.
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