In this work, it is the individual nutrition therapy of a competitive athlete of the IMSB with the disease of anorexia athletica. The athlete went into therapy in March 2012. Because of the low body weight, it was necessary to advise the nutritionally. The goal was a higher daily calorie intakethat the athlete slowly increases in body weight. Furthermore, the daily fluid intake can be increased. A balanced diet and a regular meal frequency were the targets of nutritional advice. By the food diaries of the athlete the goals could be redefined weekly..