Uni, fat is a great source of energy because there are more cal per gram in it than protein or carbohydrates. That is why our bodies tend to tap into fat when we are doing longer, slower runs, especially when in the early stages of training. Fat burning allows the body to conserve its muscle glycogen stores. As you get more and more conditioned, the body learns how to burn muscle glycogen, produce lactic acid, take in oxygen and convert the lactic acid back to muscle glycogen. Once your body has conditioned itself to "recycle" its wastes back into energy, it becomes less and less dependent on those fat stores. If you want to be a runner, but don't want to be pencil thin, think about muscle building with weight training to give your body the look of a little more fullness. This will also give you more muscle mass for even better energy production on those long runs.
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