Everything you do influences your performance, but your food choices have the most effect due to the long term and short term benefits. A proper diet, including proper selection of foods, will help your training and performance while also achieving a healthy lifestyle once you stop competing.
To help ensure a balanced diet, remember that there are no magical nutrition remedies. So forget the fads and eat a variety of wholesome foods from the four food groups--milk, meat, fruits & vegetables, and grains. Foods in these groups provide protein, fat carbohydrate, fiber and all the necessary vitamins and minerals. Your ideal diet should include the following percentage of calories:
This nutrition series is designed to help you better understand good nutrition and to provide guidelines for ideal food choices. Within sports, there are four major periods that nutrition will impact:
Training represents the period in which athletes spend most of their time. Therefore, this category represents the most critical period. During this time, a diet high in carbohydrates is important. This is important since it is not uncommon for athletes training 4-6 hours a day to burn 2500 to 4000 calories a day. The best way to replenish these calories is with a high carbohydrate diet. By being conscious of this and by taking high carbohydrate foods or drink in the first 30 minutes following a workout, you can minimize depletion of energy stores.
The major purpose of the pre-event diet is to ensure sufficient energy and fluid for the athlete. Two to three days before competition, a high carbohydrate diet with plenty of fluids should be emphasized. The pre-event meal should include a light, high carbohydrate meal three to four hours before the event.
Nutrition During Competition
Provided that good nutrition practices were followed during training, middle distance and sprint events will not be limited by nutrition-related factors. During a three to four day competition, make sure you consume plenty of fluids and each meal should include high carbohydrate, low fat selections.
Nutrition After Competition
High intensity work will deplete the muscle's energy supplies. Therefore, carbohydrates play an important role after competition to make sure energy stores are maintained.
For more information on Nutrition here are some great links from USA Swimming: