I was on carnivore diet for 120 days. There is information out there that when your in keto your body is in a fasted state. I spend a lot of time on my feet in my occupation. I would normally have to have my legs massaged out. Either with a massage gun or a massage session. Through the carnivore lifestyle after about the first 30 days my leg pains and issues went away. No massaging needed and I felt amazing. You could chalk a lot of that up to the fact I lost about 20lbs in that first 30 days but i would say it would be a combination of reduced inflammation and weight loss.

I realize you asked about fasting. My thought is you will get all the things you are after with the carnivore diet without having to fast. Just my experience though. All anecdotal.  

 Amazing!  👏👏👏👏👏I also cured a different health issue with carnivore but once I started working out more my knee pain came back. I did start eating some vegetables again though too. Will be interesting to see if I go back to strict carnivore if it takes away the problem.  

 My bet is that it will. I was extremely strict with the carnivore lifestyle. Only thing that was outside of the rules was coffee. So hope that information helps. Good Luck! I hope your knee pain subsides.  

 Thank you!