In general if you aren’t nourishing yourself enough, you will potentially lose muscle and stamina and your recovery will be longer (and more painful). If you don’t already have a solid healthful diet, you could end up doing more damage to yourself than good. Personally I would simply add juice as a carb alternative (postworkout, replacing certain amounts of breads, etc) as a part of my fitness instead of fasting or anything like that. Fasting and severe calorie deficit has only made my metabolism worsen and slowed muscular progress. That’s my 2 cents anyway.
I’ve done it and loved it. I think fasting can be good for your body but a juice cleanse is not really fasting. I would recommend garden of flavor. The juices come numbered so you know the order to drink them in. It’s a bit pricey but good IMO.
Glenn Braunstein, MD, professor and chairman, department of medicine, Cedars-Sinai Medical Center in Los Angeles, and other experts say our bodies have built-in detoxifiers and don’t require “cleansing.” Most also warn that no one should expect lasting weight loss.