<qa>  What is the cause of the oscillations in cellular energy stores?The explanation could be oscillations in cellular energy stores. Skeletal muscle contains approximately 80 of the stored glycogen alone by virtue of the muscle mass. The liver has a higher glycogen concentration, but it is much smaller. A single prolonged 24 hrs day of fasting may not decrease muscle glycogen, while the decrease in the liver is very fast. A muscle glycogen lowering effect of continued intermittent fasting would be expected, and experimentally indicated. 