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Yeah, I can't imagine there's been a mass study of vitamin use on ultras - but from a purely nutritional standpoint, if I'm eating shit designed for maximum calorie intake (mcDonald's, pizza) rather than proper nutrition, are there certain vitamins I should be looking to 'take up the slack'?
gillies-
I can't really answer that. Have a look for studies that show what nutrients are lost during such events? Bare in mind the human body is pretty good at homeostasis - if you're lacking something you will likely crave something that will help fix it.
I didn't take any vitamins with me on TCR.
Bare in mind your "mcDonald's, pizza" diet is used by many people who aren't racing across Europe and they all live until they're at least 50... or can't get off the sofa to feed...
hippy
Based on a large meta-analysis someone did I think you're more likely to die sooner if you're taking multivitamins, but for a one-off thing like an ultra race rather than prolonged use, I'm not sure there's been studies that show benefit or harm.