Oh then you'll be fine. I ran a marathon about 3 years ago, but now I opt for triathlons. I've never really thought much about nutrition. I usually take GU packs on longer runs, and then protein immediately after I finish. Good luck! You have absolutely no reason to be nervous, especially with your prior experience.
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Here's to the crazy ones. The misfits. The rebels. The troublemakers. The round pegs in the square holes. The ones who see things differently.