The Rudolf Breuss Diet is a strict, short-term fasting regimen that typically lasts around six weeks. During this period, solid foods are avoided entirely, and intake is limited to a specific combination of vegetable juices and herbal teas. The approach is based on the idea of restricting certain nutrients—particularly proteins—to create an internal environment that may disadvantage abnormal cells. After completing the fast, light foods are gradually reintroduced.

Daily intake focuses on a carefully prepared vegetable juice made primarily from root vegetables such as beetroot, carrots, celery, a small amount of potato, and black radish. The total amount is limited (around 500 ml per day), and it is consumed slowly in small portions throughout the day rather than all at once.

Herbal teas are also a central part of the routine. Different blends—commonly including sage, kidney-supporting herbs, and cranesbill—are consumed at specific times. The day typically begins with small amounts of tea, followed by gradual intake of juice and additional teas spaced out over the morning. Intake continues into the afternoon and evening with controlled quantities.

After the fasting phase, the plan recommends a gradual transition back to regular eating, starting with small portions and sometimes including supplements. Outcomes and experiences can vary significantly depending on individual health status and how the regimen is followed.