Until four years ago, Stephen Chambers was firmly convinced that Alzheimer's is fate.
His grandmother and uncle died of the disease that erases memory and corrodes personality.
His father also showed symptoms in 2013, and the diagnosis followed a year later.
Chambers, 48, a physical therapist in Jersey City, near New York, has always lived healthy, he says, doing lots of sports, football, running, weight training. But Alzheimer's - that was something “that happens to you that you have no control over”. Until he heard about Alzheimer's prevention in 2016. "A new world opened up for me."