I did a 90 day juice fast with huge success. You just have to be careful with incorporating solid food back into your system for longer fasts so you don’t cause GI upset. Incorporate smoothies since they are blended up and will be slightly harder for body to digest but not as hard as solid food & not as easy as your juices from your juicing machine. If you go for a while look up refeeding techniques to keep yourself safe. I had heavy detox symptoms that caused exhaustion the first ten days, but then soared with high energy levels after that. Felt so good to take so many nutrients into my body.