The scientific breakthrough of FMD promotes fasting-like effects on the serum levels of IGF-1, glucose and ketone bodies while supporting the body to minimize the burden and adverse effects of water-only fasting. Prolonged fasting (>1-3 days) was also found to trigger autophagy, the body's way of cleaning out old and worn-down cells, and the breakdown products are then recycled for important cell functions. ProLon mimics a water fast to support intracellular clean up and rejuvenation.