Between Juice Press and goodsugar, my team and I have helped countless thousands of people complete juice cleanses ranging from one day to sixty days. What we accumulated over those years was not a controlled clinical study. The data sets are imperfect and some could be misread. But when there is almost nothing else out there, an honest anecdotal record from a large and diverse population is a meaningful starting point.
Here is what we learned.
Juice cleanses are remarkably safe across a broad spectrum of people. That finding surprised even us at first. People with type one diabetes came in asking to cleanse, and as long as they were receiving a balanced mix of greens and fruit juice rather than pure fruit, many of them did extraordinarily well. A handful, working under their doctor's supervision, saw significant reductions in their insulin dependency. We worked with morbidly obese individuals who completed cleanses of twenty, thirty, and sixty days under medical supervision. Every one of them lost substantial weight. More importantly, every one of them came out of it with a fundamentally different relationship to food, to their dietary attachments, and to the habitual and often addictive behaviors around eating that they had never clearly seen before. A cleanse creates the conditions for that kind of reflection in a way that almost nothing else does.
The most important thing to understand about a juice cleanse is also the least intuitive: the primary benefit is not the juice. It is the absence of everything else. When you cleanse, you are removing all of your ordinary dietary mistakes from the equation simultaneously. The immediate improvement in your chemistry is directly proportional to how much damage those mistakes were doing. Everyone is different, which is why results vary, but the mechanism is consistent. You are not adding something miraculous. You are getting out of your own body's way.
This means you do not need special juices timed at specific intervals in a specific order. The protocols you may have seen are largely unnecessary. The body does not require that level of management. It requires the removal of the burden.
A few practical things worth knowing.
Do not do extreme exercise during a cleanse. That impulse is usually anxiety-driven, a desire to crash the diet and force weight loss. You will lose weight on a cleanse, but if you push too hard physically without adequate caloric support, you will put it back on when you return to solid food and you will have learned nothing about your relationship with eating. The goal is not to suffer through it. The goal is to rest the system and pay attention.
Not everyone feels great on a cleanse. Some people feel tired, particularly in the first three days. Others feel immediately invigorated. Both responses are normal and neither is wrong. What matters is staying the course long enough for the body to shift into a cleaner operating state.
You do not have to be strictly liquid to benefit. If you need more calories to function at work or move through your day, add a smoothie. If you are attempting a longer fast, a combination of juices during the day with a simple vegan salad at night, no animal protein, is a perfectly valid approach that reduces digestive burden while keeping your energy stable.
The word cleanse is imprecise, which is worth acknowledging. Your body is cleansing constantly. It detoxifies through multiple waste channels every hour of every day. What a juice cleanse actually does is make that ongoing process more efficient by removing the dietary inputs that ordinarily slow it down or work against it.
If you are doing your first cleanse, start with one or two days. Begin with a smoothie. Eliminate coffee. Pick up four juices through the day, two green and two mixed vegetable with fruit. Do not go all green because the caloric restriction will leave you weak, especially if you are working or exercising. Drink water between juices. If you are hungry, drink another juice. And for the love of everything, get some sleep.
All statements herein have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.