People never ask if you ran a marathon, or walked part of it, they are just impressed that you completed it. It'll probably take several goes (if ever) for you to run one all the way. I always walk the aid stations, as I can't drink whilst bounding along (although I wouldn't call what I do at 24 miles "bounding"). And I still walk near the end: When you hit the wall, you hit the wall. No-one will ever sneer at you for that.
Actually, I don't think even the elite usually ran a whole marathon until the latter half of last century, and carbohydrates were appreciated. Run/Walking was a normal part of the marathon. (They didn't have gels in those days!)
Big Bopper.
B.O.P. till I drop.