[Soldier]

Originally Posted by austin.j.taylor

The word carb is not used in the correct context here. They are talking about burning glucogyn, which is a sugar that your body makes and stores in the liver. Your body makes glucogyn one of two ways, converting carbs that have been eaten, or converting stored fat to glucogyn. When you are low carbing for an extended period of time, like in keto or tkd, your body willingly uses stored fat for energy. It can only do this efficiently for so long before a refeed is needed.

For optimum performance this is the case, but the body can derive energy from any nutritional source. It'll work with what it gets, or if it gets nothing it'll start to eat itself.