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Glycogen and Ketones1) Does the body deplete muscle glycogen first, before it switches to using ketones?
The percentage of muscle glycogen and ketones used is dependent on various factors; primarily diet and your training protocol.
The Ketogenic Diet
The Ketogenic Diet depletes glycogen in approximately 3 days and the body shift over to using ketones for energy.
Fasting increase the fat burning hormones (nor-ephedrine, ephedrine, glucagon, cortisol, etc). Research shows fat burning as well as you metabolism initially increase.
Muscle Glycogen Restoration2) A keto-adapted person will have glycogen restored first via ketones?
Research shows that muscle glycogen level are restored to approximately the same as those on a Traditional Western Diet, once Keto Adapted. There a time element to it.
Muscle Glycogen Restoration occurs via gluconeogenesis. Protein and Glycerol from Triglycerides are converted to glucose and stored in the muscles.