RESUMEN
In order to consider sports nutrition, the position of dietitians and nutritionists needs to be recognized first among people involved in sports. The author, therefore, introduced the roles of nutritionists.<BR><BR>What is the most required nutrition for athletes?The author thinks it is carbohydrates, not proteins. The least required is fat. If that is the case, the percentage composition of total energy intake from traditional Japanese meals seems to be very close to the most ideal diet for athletes. Fluid intake is significant to prevent hyperthermia. In order to estimate the amount of sweat, body mass before and after training as well as the amount of water intake needs to be measured. Fluid intake is considered based on these values. <BR>In addition, instructors should pay special attention to other problems especially with female athletes. Next, the author introduces a diet intervention that we provided for female lacrosse players at our university. Based on this research, it was proven that short-term diet intervention can produce effects on the athletes'body composition, tenacity and the feeling of fatigue.