Nutrition and the ways of weight maintenance are shown in this work. Caloric requirements of the match as well as the training process's requirements are described from introductory till final part. With specific elaboration of menu for boxers and ways of weight maintenance with respecting weight categories, it describes the positive impact of proper nutrition for boxers. Nutritional recommendations for physically active individuals mainly correspond with those mentioned in order to achieve optimum health of the general population with certain differences due to physical activity requirements. Fundamental differences arise from: increased energy consumption due to physical activity (500 to 1000 kcal / h) and loss of water by sweating (0.29 - 2.6 l / h). Boxers have nutritional needs which are considerably different from other sort of sports. Increased food intake for statisfying energetical needs are primarly ensured by adding proteins, carbohydrates and essential micronutrients. It is also necessary to take care of proper food choice in order to provide all the essential nutrients within a limited supply of energy. The main guidelines in reflection and development of proper nutrition must be seen from the point that it is an individual sport. That means that the guidelines must be harmonised with individual sports programme and directions. In closing considerations, weight categories in boxing impose the need for establishing different means of weight maintenance. These means are: body mass control, proper nutrition and mental rest. An expert must be taken into consideration when there is an issue about monitoring and controlling body mass. Under professional supervision, boxer is able to accept new food regime in case that he or she wants to increase or decrease weight respectively, to change weight categories.