Without knowing the exact cause of Alzheimer’s, there is no way of determining how to prevent it. However, there are a number things that many in the medical field do suggest as a way of lowering your risk.
Now, after doing some research I found a list of methods for preventing Alzheimer’s Disease from "U.S. News and World Report" that says anyone who is concerned should consider:
Nutrition and dietary supplements.
Social connections and cognitive engagement.
Exercise and leisure activities.
Smoking and drinking habits.