The Diet Pepsi connection

Fox, Michael J.: "He was a blur. That's how I remember Michael J. FOX the first time we talked. It was 1987. I'd come to Los Angeles to interview him for a Maclean's cover story, and we met at a Family Ties rehearsal at Paramount. He bounced around the set like a hyperactive kid, cranking Diet Pepsi, and kept ducking out to smoke Export 'A's, lighting one off the other. During a break, we hopped into his black Ferrari for a quick trip to his house halfway across town, and he tore down the Hollywood Freeway at twice the speed limit, his seat belt unbuckled, the dashboard dusty with cigarette ash, the floor of the car littered with beer cans." - an excerpt from a Maclean's interview with Michael

I'm just looking up sites that mention Michael's heavy use of Diet Pepsi, for future reference. I had heard it batted around as a potential cause of Parkinson's but didn't really dig into it or anything.