We use at meets, as well as every practice. Athletes bring their own ingredients. Some of the better recipes, according to our athletes, have been the following:
[ul][li]pineapple, strawberries, peaches, oranges, lemons, papaya, sugar cane (beginning of practice week)beet, carrot, celery, cucumber, vanilla, nuts, sugar cane (2 consecutive days after meet)carrot, apple, lemon, orange (on meet day)
One drawback I can see with juicing too much is the removal of fiber. Fruit juice is basically just sugar water with a smattering of micronutrients and not a substitute for eating whole fruits. Having said that, it’s probably a great way to creatively supplement your fruit and vegetable intake.
As far as being good for sprinting, good nutrition is good for sprinting and anything that makes it easier or more convenient will help.