I now aim for a 3-day fast once per month and a 5- to 7-day fast once per quarter. I would like to do one 14- to 30-day fast per year, but the logistics have proven too inconvenient. The longest fast I’ve done to date was 10 days. During that fast, I added vitamin C IVs and hyperbaric oxygen (2.4 ATA x 60 minutes) 3 times per week. I did DEXA body scans every 2 to 3 days for tracking and also consumed roughly 1.5 g of BCAAs upon waking and roughly 3 g of BCAAs intra-workout. After a 10-day fast, I had lost zero muscle mass. In contrast, I lost nearly 12 pounds of muscle in that first 7-day
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