 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. 