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carbohydrates, which their body needs. Once all the available carbs are used to supply enough energy the body will start using proteins that were either recently consumed, or it will use the protein in the tissue structure. When this happens it can break down your muscle tissue so it’s important to have enough stored protein. Marathon runners do not have a lot of muscle mass and they need to eat enough proteins to avoid the muscle tissue breaking down. Consuming plenty of proteins will ensure that should something happen to your tissue, there will be plenty of amino acids to help repair the tissue. 25