Ski jumping is a specific sport where even the smallest impacts play a major role in the final result. One of the factors behind the end result is jumpers' body weight. Therefore, jumpers have problems with their body weight, nutritional disorders and in some cases even severe eating disorders. Because of that FIS (Fédération Internationale de Ski) introduced new rules about maximal ski length according to jumper’s body mass index. Since optimal nutrition is one of the factors to prevent injuries and illnesses and allow for smooth training and competition, sports dietitians have begun to become involved in the diet of ski jumpers. The goal of proper nutrition is to make ski jumpers very slender and lightweight, allowing them low air resistance and longer jumps. Ski jumpers’ diet is based on general sports diet recommendations, but is accordingly changed in order to fit each individual. While ski jumpers are nutritionally endangered, it is important that they get individual nutritional counselling by a professional sports dietitian in case of health or training issues. A coach and a doctor are also involved in nutritional care process.