5) Expect some muscle loss
Don’t be surprised if you lose a little muscle at the end. During this phase, your body goes into a negative nitrogen balance from the absence of protein. Since you aren’t consuming enough protein to maintain muscle mass, the body will break down muscle.
“Whenever you restrict yourself from fuel, your body has to get energy from somewhere and it will start to break down muscle for energy,” says Gidus.
However, any muscle lost during a short term juice fast or cleanse will rapidly rebuild once normal eating and training resume.