Three decades into his career as a neurologist at Mayo Clinic, Dr. David Dodick decided to make a change. As a neurologist, Dodick treated his patients after they'd experienced memory loss or had a stroke, he says. "Knowing that these diseases had been brewing for decades before the patient finally walked through the door, I felt like we could be doing so much more to optimize their health, to prevent them from having to come into the hospital with a stroke or complaining of memory loss," says