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Published on Oct 2, 2010
The biggest challenge ultra runners face is electrolyte/sodium balance.
It doesn't matter what your diet is, whether you are a fast food junk eater, a vegetarian, vegan, a raw foodist, or a fruitarian like me: Keeping proper blood sodium levels in ultra distance running is the going to be one of the most critical challenges in reaching your goals safely and feeling good.
Attempting to take natural sources of high sodium foods like coconut water or celery juice is very hard to manage on a practical level in training or racing conditions.
Please do not take advice from someone who has no practical experience in this sport. This is a potentially lethal health issue.
If you don't believe you need additional sodium for ultra distance running, just try to run for more than 4 hours in heat and humidity without additional sodium intake, then try it with sodium intake.
The difference is night and day, even if you've been on a very low sodium diet like I've been as a fruitarian.