How long are you planning on, and how much in the way of onboard calories are you carrying now? And how hard are you planning on pushing? I'm not possitive, but I bet that food in the belly is easier for your body is easier to access than backup "food" around the belly. :P
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.