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.
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.