I have been tracking a lot of my numbers while doing the FMD once a month for six months (w/ one 5-day water fast in the third or fourth month). I have had great results. I know the point is not weightloss, but i have lost 15 pounds. As far as health markers, my A1C has dropped into the normal range, hemoglobin levels have improved, cholesterol has been cut in half (although it was at a worrisome level before I began), and my blood sugar gets lower everytime I do a fast.
I experimented with the macros, too, in order to make the food a bit more appetizing. So far, I stick to the calories as prescribed, keeping protein low and zero animal protein, and have the same biomarkers improve as Longo's study suggests. Maybe someone has an answer to that but I'm guessing the calorie restriction and Ketosis are reaponsible despite departing from Longo's macros?
I recently have started using a company named Lifebox, too. They kinda take the brain work out of it and send you a subscription box with all the food you need for a 5-day FMD. Works really well for me on weeks when I am pressed for time and just need an easy way to run my fast. Their website is here: https://www.lifebox.diet
Thanks for questions or replies in advance!