What is Alzheimer's Disease and Why Does it Happen? What Can You Do to Take Preventive Measures?

Affecting about 44 million people globally, Alzheimer's disease is the most common cause of dementia. It could begin progressing 20 years or more before symptoms become apparent.

Though we're still learning about this disease, experts believe there are things you can do to be proactive about your brain health—and potentially prevent Alzheimer's or other forms of dementia.