Throughout a long career in researching the brain and Alzheimer’s disease, Dr. Gary Small picked up a few longevity habits of his own.

“When you’re in this field for so many years, it’s hard to resist following your own advice,” Small, a neuroscientist and psychiatrist based in Los Angeles, told Business Insider.

Small, who has a psychiatry practice focusing on memory loss and is a professor of psychiatry at UCLA, said that age is the biggest risk factor in developing Alzheimer’s.

“Thanks to modern medicine, we’re living longer,” he said. “The rub is that our brains weren’t engineered to function well that long.”

Still, he said lifestyle factors…