Here are 10 high-performing "he-man" vegan athletes.
Track star: Went vegan in 1990; won the 1991 World Championships in Athletics.
Boxer: Fighting Manny Pacquiao on June 9 at the MGM Grand in Las Vegas.
Mixed martial artist (UFC): Ultimate Fighter 6 winner, 2007.
Ultramarathoner: Winner of multiple endurance runs; in 2010, set U.S. record for 24-hour distance run.
Bodybuilder: Won Mr. Natural Universe in 2009.
Triathlete: Top finisher in 2008 and 2009 Ultraman World Championships.
Ironman: Canadian Ultramarathon Champion in 2003 and 2006.
Boxer: Yes, that Mike Tyson. Vegan since 2010.
Bodybuilder: Won INBA Overall Novice Champion (USA) in 2005.
Triathlete: While vegan, became first six-time Ironman Triathlon World Champion.