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Even more interestingly, if you simply swish sugar water in your mouth, and spit it out, you get a similar effect. If your body thinks it's about to take in more energy, it will be more liberal in allowing energy to be used. You feel subjectively tired well before your muscles actually physically fatigue to the point of being unable to maintain effective use, and researchers think that part of the perceived fatigue is a mechanism for energy conservation, which you can get around with simple tricks 
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