“Research has shown that caffeine, a categorical opiate in coffee, improves continuation by provident glycogen, that is your muscles’ primary fuel source,” says Fine. That means that your physique won’t “run out of gas” utterly as fast given a physique typically burns by a glycogen stores in about 2 hours. By provident it, you’ll have some-more for later. On a flip side, caffeine can assistance we energy by a examination when your glycogen stores are already low (think: if we haven’t eaten in a while, are doing a morning examination before breakfast, or are on a keto diet). Why? One theory: A study on cyclists suggests that, when glycogen stores are low, caffeine competence concede your muscles to some-more well metabolize fats for fuel, rather than rest on flesh glycogen stores.
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