Many people eat daily according to the principle "It is useful that it got into their mouth," without thinking about the consequences of such a diet. Others intuitively stick to the basics of healthy eating without getting into the details. Still others periodically torment themselves with strict diets, not understanding why they do not get a long-term and stable result. In this book, we have collected and structured 15 basic power systems. You will find a detailed description of each, its useful properties, recommendations for use and disadvantages of each method. There may be medical contraindications, a specialist consultation is needed.