I've done multiple 3 day, multiple 5 day, and two 10 day fasts. The only intake in these was water and electrolyte stacks, and in one of the 10 days there was b

I've done multiple 3 day, multiple 5 day, and two 10 day fasts. The only intake in these was water and electrolyte stacks, and in one of the 10 days there was bone broth taken 2-3 times per day. All of these were self-induced without medical oversight, and the impetus was weight loss and testing myself. To keep the take-aways short, here's what I found: 1. Do not attempt to do any sort of exercises that require real exertion (slow walking is fine) while doing fasting of any kind, and I would (given my experience with ketogenic diets) extend this to keto as well, especially when lifting weights. Despite what some liars and/or freaks will tell you, you cannot be fasted or ketogenic and maintain quality performance. 2. The 3 days are probably fine if you do them with a couple of months in between if you have other goals you're working on (like building muscle). Doing them every week will minimize any other fitness goals that you may have. 3. The 5 days and over left me feeling tired, but the tiredness would come in hard waves. For instance it was not uncommon to want to immediately fall asleep at random hours of the day only to feel wide awake at 2am the next day. Just being hungry messes with your sleep, and I suspect (but have not confirmed) that it probably messes with your circadian rhythm. 4. I lost more cumulative weight running two 3-day fasts than I did with one 10-day fast. This was confirmed against both of my 10-days. Most will attribute this to water weight, however in the +5-6 days after the fast ended I was still lighter with the cumulatives. 5. There were only a couple of times where I got that euphoric feeling that many claim to get, and that was only in the first two fasts I did. All subsequent fasts did not produce this. 6. In the last 5-day+ fast I did I experienced some weird neuropathy in both legs and hands, despite being fully hydrated and taking electrolytes. I immediately broke fast and felt better and have not experienced any neuropathy since. 7. I no longer do long term fasts, instead opting for intermittent fasting (16:8) daily for several reasons, coupled with not eating bread or pasta. This seems to have much better and more sustainable results.