In recent years, many investigations have been carried out on the nutritional status of different population groups, however, the nutritional situation of swimmers was unknown. The objective of this study was to evaluate the nutritional and food situation of the swimmers of the National Team in their 'senior' category, during the training stage, 1997. A total of 16 athletes were studied, 9 men and 7 women. In addition to the anthropometric measurements, their blood biochemical indicators were evaluated, their diet was evaluated using the daily recording method of 3 days, their energy expenditure was estimated through the daily register of physical activities Bouchard Questionnaire. The results showed adequate fat percentages for both sexes, adequate blood biochemical indicators with the exception of women whose serum ferritin levels are considered low. 56% of men consume vitamin and mineral supplements, the diet of the whole group is deficient in fiber and alpha-tocopherol, ingest megadoses of thiamine, riboflavin and pyridoxine. Its energy balance is adequate, not the composition of the diet or the energy distribution in the day. 43% of women consume vitamin and mineral supplements, their diet does not meet the needs of fiber, calcium and niacin. Women not taking supplements reported a diet deficient in dietary fiber, alpha-tocopherol, calcium, iron, and zinc. All women have a negative energy balance, inadequate dietary composition and inadequate daily energy distribution. This study concludes that women do not present an adequate nutritional status for an athlete and constitutes a population at risk of suffering the triad of medical problems that afflict the athlete. Men, on the other hand, maintain an adequate nutritional status which favors their sports performance.