Have no clue why joint pain would increase. Especially not with just broth and tea...broth is supposedly great for joints! You wrote that you wanted to do 36 hour fasts for faster weight loss, but if I had those side effects, I would certainly have abandoned that idea quickly. Did you add back any Resistant starch or starchy veg? PGX? It may be the mental aspect of knowing you have at least one meal everyday as much as you want, that makes the alternate day 24 hour fast easy for me. Maybe see how you feel doing that first? I have actually slept better after a large dinner with more fiber veg, some lentils, and berries for dessert.

I'm taking a slow, see how it goes, no effort approach to this experiment. I had a large buffet lunch yesterday so for the first time today, will try a 30 hour fast to dinner. If I don't feel OK this afternoon, you can bet I'll eat food. Whimpy. I think before trying a 36 hour fast the 24 hour everyday option would be more doable for me.