All body processes require energy to run properly. When the body is using more energy than it is taking in (e.g. when exercising), body cells rely on internally stored energy sources, like complex carbohydrates and fats, for energy.
The first source the body turns to is glycogen, which is a complex carbohydrate created by the body when there were enough reserves of sugar and other carbohydrates. When the glycogen source is nearly depleted, the body begins lipolysis, the metabolism of fat for energy. Lipolysis will break down the fats into glycerol and fatty acids, which can then be used to make energy.
This means that unless there are almost no carbs in your body reserves, there will be no lipolysis and thus no fat burning.
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