What Happens If We Continue to Fast for Longer Periods

As the fast continues beyond a day or two, liver glycogen is no longer a major energy storage resource. Body fat breakdown is in high gear and becomes the major fuel source. Keep in mind that because all cells in the body have at least a minimal need for glucose at all times, our liver will need to generate some glucose. Amino acids become the major resource for this process. Most of the amino acids will be derived from skeletal muscle protein at first. Thus, with severe energy restriction you can certainly count on burning body fat, but you will also lose body protein (that is, muscle mass). This is usually not what we want!

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