How are juice cleanses and the psyche connected?

A juice cleanse changes not only what you eat, but also your daily routine, your rituals, and how you feel in your body. That is why you often feel the effects in your head as well. A typical mood progression moves in waves: exhausting at first, then calmer for many. When it comes to juice cleanses and the psyche, the framework counts for more than the juice itself.

Knowing the boundaries is important. A cleanse is not a treatment for depression, anxiety, or other mental illnesses. If you are experiencing mental health challenges, consult your doctor before fasting. Our article "Does a juice cleanse actually do anything?" takes a look at what a cleanse can achieve as a whole.

In the first one to two days, your body is adjusting its energy supply. It depletes the sugar stores in the liver and muscles, which leaves many feeling tired and thin-skinned. The DAK (German health insurance) lists chills, headaches, fatigue, and exhaustion as potential companions during juice fasting (DAK, 2025). If you suddenly cut out coffee as well, this often amplifies the irritability.

The mind itself is just as important. Food provides comfort, reward, and structure to the day. If that is removed, gaps emerge, and that is exactly where thoughts about food creep in. Additionally, there is the social aspect. You suddenly find yourself sitting with a bottle while having lunch with colleagues or dinner with friends. When it comes to juice cleanses and the psyche, many underestimate these very rituals, not the hunger.

The body of research is thinner than many advertisements suggest. There is hardly any reliable data on juice cleanses and the psyche in a narrower sense. Studies on fasting in general are more informative, and even there, it is worth looking closely.

In a large observational study involving 1,422 people fasting over four to 21 days, a clear increase in physical and emotional well-being was observed. Around 93 percent reported that they did not feel hungry (Wilhelmi de Toledo and colleagues, 2019). However, the participants were fasting under medical supervision in a clinic, and there was no control group. The Ärztegesellschaft Heilfasten und Ernährung (ÄGHE) also describes that most people who fast notice an improvement in mood after initial malaise (ÄGHE, 2025).

A review of eleven studies with 1,436 participants reached a similar conclusion. In randomized trials, anxiety and depression scores were slightly lower in the fasting groups than in the control groups (meta-analysis, 2021). The researchers themselves emphasize that the studies were small and that no people with mental illnesses were examined. For juice cleanses and the psyche, this means that there are indications of improved well-being, but no guaranteed effect.

For some people, a juice cleanse and the psyche simply don't go together. This is not a weakness, but a matter of timing. The DAK expressly advises people with an eating disorder against juice fasting, as well as those with chronic illnesses (DAK, 2025). Anyone who has recovered from an eating disorder should also rather refrain, as restriction and control can trigger old patterns.

The same applies to existing depression, an anxiety disorder, or an acute crisis. If you are taking medication for mental health, talk to your doctor before any fasting phase. A period of extreme stress with little sleep is also a bad time; in those cases, a calm, regular diet is usually the better support. If you are unsure whether a juice cleanse and your psyche are a good match right now, it is better to ask once too often. Postponing costs you nothing.

If you notice during the cleanse that your thoughts are constantly circling around food, that you feel guilty, or that your mood is significantly dipping, stop. Then seek support from your GP practice or from a psychotherapist. You can find a detailed checklist in our article on who is suitable for a juice cleanse.

Most mood dips can be mitigated with a good framework. The most important step happens beforehand. Schedule the first two days of the cleanse during quiet times, reduce coffee during your prep days, and let friends or colleagues know that you are eating differently during these days. How to plan this is shown in our article on juice cleanse preparation.

During the cleanse, small substitute rituals help to give your day structure again. Drink your juice consciously at the table instead of on the go, go out at lunchtime, and write down two sentences in the evening about how you feel. This way, you learn a lot about how the juice cleanse and your psyche interact. This observation is often more valuable than any number on the scale.

After the cleanse, it is important not to fall into an abrupt transition. A calm build-up of diet also keeps your mind more stable; this is described in our article how to build up correctly after a juice cleanse. If you want to try it out, you can find all variants in the juice cleanse overview.

Juice cleanses and the psyche influence each other. The first few days are strenuous for many because energy, coffee, and familiar rituals are missing. Afterwards, many people who fast report more peace and clarity. Research supports this as an indication, not as a proven effect.

A cleanse cannot replace treatment. In the case of eating disorders, depression, or an acute crisis, it is the wrong path. For everyone else, the rule is that a good framework protects the mind more than any juice. Those who think about the juice cleanse and the psyche together plan quiet days, consciously replace rituals, and take an honest observation with them into everyday life.