Former heavyweight champion-turned-movie star Mike Tyson has credited his vegan diet for helping him find health and happiness.

In a new episode of Oprah Winfrey's Where Are They Now, which will air in America on April 9, Tyson reveals his lifestyle has given him new-found stability that has turned him into a better husband and father.

The Hangover star explains, "I'm not on drugs, I'm not out on the streets, I'm not in clubs. And, everything that I do now is just basically structured around the development of my life and my family.

"I lost weight, I dropped over a hundred pounds. I just felt like changing my life, doing something different. And so I became a vegan. Becoming a vegan, it gave me another opportunity to live a healthy life. I was just hard wheel, so congested from all the drugs and bad cocaine, and I couldn't hardly breathe, high blood pressure, almost dying, and arthritis.

"Once I became a vegan, all that stuff, it diminished."