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The whole thing is that you do want to get the energy "out of" what you eat -- and you can metabolize carbs/"sugars" easier than other things. It could be (tho I do not have the background to say this one way or another) that your body turns up its proverbial nose at high-fat foods, or high dense protein foods, during the marathon BECAUSE it "knows" that it would take a lot of blood, effort, etc. to get the energy "out of" that food.
There are some "specifics" tho -- e.g., you do want to keep an intake of electrolytes going (and more if the weather is warm). Electrolytes are salts -- and they keep the "electricity" running that is in your blood, that keeps your heart going etc. So if you were to decide, for example, to just eat sugar (which would be high energy, but you would crash right after -- you know the old "sugar low" thing), and water, you would not be getting in any electrolytes/salts. This would probably not be the best idea.
Elsewhere in this BB we have talked about the various merits of various "replacer" drinks, as well. For example, Gatorade does not work for me -- tho it has some electrolytes, the solution is too sugary and "crashy" for me. On the other hand, Endurox *really* works well for me -- it has a protein balance in it, that helps to keep your blood sugar balance more "even" -- and so if you use it, then something that is high "energy" (a GU, whatever), then more Endurox, etc. the proteins and bound carbs (again, for me, and there seems to be some research to "prove" this) keep my energy level up and more "accessible."
So -- that's sort of a long post -- but the idea of "just eating something" isn't quite right......then again, people used to eat NOTHING, right? So maybe in THAT case, "something is better than nothing."
I read elsewhere on this BB the quote "pain is inevitable; suffering is optional." That really made me laugh, but that really seems to be words to live by. Finding stuff that works for you -- whether it's shoes, food, drink solutions, or the like is all part of the "fun" of the countdown to the race. No?
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