This is an interesting question and quite timely, as i just experimented with something similar today. I do time restricted feeding most days, usually going between 20-24 hours fasting and a 1-2 hours eating window. I have been doing this a lot over the last few years and it has helped me reduce/maintain weight at 165-170 pounds 5’10” height. I have only recently realized how much i was deficient in electrolytes and so for the last week or 2 I have actually been taking sodium/potassium/magnesium glycine at the quantities recommended in the sidebar, and overall i feel much better during my fasting periods. I also try to get plenty of exercise with walking, running, and weight training, which usually occurs during my fasting periods due to schedule. Today when I began my weight training (pull ups and squats) I noticed that I was feeling fatigued quite early on and looked at the clock to find i was close to the 4 hours that i space my electrolyte doses out, so I paused the workout, went and took one of my 5 daily doses of electrolytes and then resumed the workout to find that I wasn’t feeling quite as fatigued and my muscles weren’t burning as much or as quickly as before I topped up my electrolytes. Now, this wasn’t a huge boost or anything, but it did help me complete my planned sets/reps, and yes, it wasn’t double-blind or anything so there could be some placebo effect, but it was enough that i will continue to watch my electrolyte dosing closely as it relates to starting my exercises because the early indication is that for me personally it does make a difference, even if we’re talking about relatively short fasting periods, and relatively frequent dosing of electrolytes.