From the Official GAA website (read more at http://www.gaa.ie/medical-and-player-welfare/nutrition/):
Maintaining good nutrition is essential for everyone, but for serious sports people, it can be the difference between winning and losing. When you consider that all teams contain talented players and conditioning levels are high, nutrition can be the most important factor in improving performance.
Fact Sheets on Sports and Exercise Nutrition
The Irish Nutrition & Dietetic Institute (INDI) is the professional organisation for dietitians in Ireland. They believe that good nutrition helps individuals involved and interested in sport maximise power and endurance as well as overall performance and health. To view INDI facts sheets on sports and exercise nutrition, please click here.
Supplements and Sports Foods
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A substantial amount of misinformation exists regarding optimal strategies for achieving peak athletic performance and health. Many ‘nutritional’ products are sold under the pretence that they hold the secret to enhancing performance, however, it must be noted that these typically lack research and sport medicine literature is filled with cases of athletes who have used such products with negative unintended consequences. There is no substitute for matching good food intake with nutrition needs. Proper nutrition supports training and can improve performance, whereas improper nutrition can be detrimental to performance. A well-planned eating strategy will help any training programme, whether you are training for fitness or for competition; promote efficient recovery between workouts; reduce the risk of illness or overtraining; and help you to achieve your best performance.
Athletes need to be aware that there are risks associated with the use of sports supplements with many positive drug tests associated with their use. For more information, read the Irish Sports Council Supplements and Sports Food Policy by clicking here.
Useful fact sheets in relation to supplements are available on the Institute of Sport website at: