Just watching Finding Traction about Ultra Marathoner Nikki Kimball.
The film is about doing a 270mile trail run in Vermont and guess what she has for food, yep eggs, bacon, high fat
quick google and confirmed she is fat adapted and Keto - http://www.enduranceplanet.com/nikki-kimball-on-depression-a-fat-adapted-diet-and-ultrarunning/
How much more evidence is needed for anyone involved all but very explosive sports ?