I found this great video on Buzzfeed giving a brief overview of your body while doing a Juice Cleanse, pointing out the some of the cons of going on a consecutive juice fast.
Personally, I don't believe in cleansing for more than one full day. After that, your body goes into starvation mode and it ends up back firing. I would never advise someone to do a cleanse to lose weight, either. Thats equating starvation with weight loss, and while it will make you lose mostly water weight, it will come right back as soon as you start consuming solid food again. Working out while doing a cleanse, is not safe. Save it for your rest day and really nourish your body.
Juice Cleanses are meant to do just that, cleanse the body. I usually do a cleanse after a weekend of bad eating or partying to get the toxins out of my body and give my digestive/intestinal system a break to cleanse itself.
Juice is not a meal supplement. It should just be added to your daily diet for additional beneficial nutrients. If you hate eating your veggies, I would invest in a juicer and drink them! Just be careful not to add in too many sugary fruits.
