In most cases, the initial weight loss in the process is simply a reduction in calories and fluids, not a biological cleansing. Sometimes the damage comes from deficiencies and the expectation that a short-term solution replaces long-term health.
“Detoxing” is an idea that feels logical. Modern life is full of pollution, processed food, alcohol, stress, so why not drink only juices for a few days and let the body "cleanse"? This myth survives because it offers a simple, understandable solution. But medically, one should ask a simple question: Which toxins exactly, where are they measured, and what changes after the diet? In most cases, there is no verified answer.
The liver is not a filter that needs to be “washed” once a month. It is a complex metabolic organ that breaks down substances and prepares them for excretion. The kidneys filter, and the intestines and skin participate in clearance. This system works all the time. If it is not functioning properly, that is a medical problem that is not solved with green juice.
How did the myth arise?
The myth relies on language that mixes science with feeling. “Toxins” is a word that can explain fatigue, bloating, headaches, and problematic skin without defining anything. Into this vacuum come recipes, powders, and juice fasts. Marketing uses medical terms but does not always provide medical evidence.
Current evidence shows that studies and reviews have found no convincing research supporting "detox" diets as a mechanism for removing toxins from the body or as a treatment for diseases. Sometimes people experience weight loss at the beginning, but the main reason is usually a large calorie deficit, less solid food, and sometimes fluid loss. Once normal eating resumes, the weight tends to return, especially if long-term habits are not established.
There is also a risk side
Juice diets can be low in protein, essential fat, and fiber, which can lead to hunger, weakness, constipation or diarrhea, and dizziness. In people with diabetes, a sudden change in calories and carbohydrates can disrupt balance. In those with kidney or liver disease, an unsupervised "detox" can be dangerous.
This does not mean that juices are "bad." Juice can be part of a diet, although in most cases whole fruit is preferable because of fiber and satiety. The problem begins when juice is presented as a treatment that replaces a balanced diet or as a way to fix weeks of habits in one day.
What does support the liver?
Less alcohol, normal weight, physical activity, a diet that reduces the load of ultra-processed foods and saturated fat, and vaccinations as needed against hepatitis. These are steps with biological logic and evidence. Juice detoxing is a nice story, but in medicine, a story is not enough. The liver does not need to be cleansed – it needs us not to overload it over time.