Water, lemon juice and apple cider vinegar, black coffee and mct oil, vits and minerals, amino acids.
Your gut bacteria go dormant, that’s why further up in the thread, I said, your first meal should be pre and pro biotic, to get the gut up and running quickly.
Fat is lost, the muscle loss is negligible over 6 days, and if you lift weights while fasting you can increase muscle mass quickly, when your body switches over to running on keytones, because it starts producing large amounts of growth hormone, up to 50,000 times the normal amount as well as testosterone.
You are actually repairing your body faster after macrophages clear up dead and dying cells and other junk that causes cell malfunction, your body will not tear down healthy ones in that short span of time, unless it runs out of fat to convert to keytones for fuel.