Carbohydrates are the key source of energy (fuel) in the human body. Carbs contribute 4 kilocalories (kcal's) per gram by weight. Carbs can be converted in the body into either glucose (desirable) or fat (undesirable).
Interestingly, your body requires carbohydrates to burn fat. You typically store about 200 grams of carbohydrates in the muscles and another 90 grams in the liver. Your liver stores are used as fuel for the brain and typically remains untouched during times of muscular distress.
Carbohydrates are generally categorized as:
...but are more specifically classified as:
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