I don't know anything about the other two athletes, but I do know a little about Zabriskie. His inclusion in this trio is a bit humorous. Zabriskie's big splash in the news before his doping scandal was that he'd gone vegan and was eating a massively high carb diet about like every other tour pro, except that Zabriskie was getting his protein from weird (to me) veggie protein shakes and eating salmon. Before that, Zabriskie was touting his incredible results from going gluten-free. What we have here is a talented guy with a nose for getting himself in the news by championing the latest pop diet. He's a very good rider, but so are a lot of other guys who get good results from eating totally different diets, just like Zabriskie himself has done. I see it as publicity stunts which seem to have little effect on race results. The guy's talented, works hard, and has hired good coaches. Good on him. Also possible that he's sensitized himself to many ordinary foods by the over-consumption necessitated by his sport.

I know a tri woman who's a rather ordinary rider, but earned a good bit of money to plow into her sport before she retired. She has several coaches, one for each aspect, has worked very hard at her sport, and has some decent achievements. It's not easy to go to Kona. Oh - her diet? She spends over $1000/year at Hammer. Interestingly, she was one of those women with terrible eating issues until she discovered that food was fuel. Her sport made it possible for her to eat relatively normally, though perhaps with a slightly abnormal psychology. Perhaps her drive coincides with the drive of others to espouse particular diets.

This all reminds me of a standard greeting among hippies back in the 60's, "Hi, what are you eating today?"