Bad health habits and lifestyle choices are among Alzheimer's causes

Stress, inactivity and even certain medications can weaken memory. When it comes to preserving memories, we are sometimes our own worst enemies. The lives we lead often undermine the complex process of creating and retrieving memories. And they can boost the odds of our developing diseases -- including Alzheimer's -- that further ravage the brain's mechanisms of memory. Here are things that science tells us pose the greatest threat to our memories: Knowing them, says UCLA neurologist Dr. Gary Small, may allow us "to act early to prevent."

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