Plant-animal subsistence ratios and macronutrient energy estimations in worldwide hunter-gatherer diets1,2

For athletic performance I'd use the axiom a species evolves to it's environment.  That is eat what your ancestors ate.  I'd say the evidence suggests human's are omnivore, eating more meat in the diet as they  lived closer to the poles-http://ajcn.nutrition.org/content/71/3/682- A quick scan of food calories should dispel the notion we are herbivores eg. one'd would have to eat 38 plus cups of raspberries, 27 plus heads of lettuce, or 21 plus apples per day to equal 2500 calories