KEY POINTS Because so much of the running in soccer is at less than maximal sprinting speed, creatine supplementation likely provides no benefit to match performance.Overwhelming evidence proves that a diet rich in carbohydrates can fill muscles with glycogen, and glycogen is critical to optimal performance in soccer. Soccer players’ diets, especially in the days before hard training or competition, should include 8-10 grams of carbohydrate per kilogram of body weight (3.5-4.5 g/lb). Cereals, fruits, vegetables, breads, and pastas are good sources ofcarbohydrates. Refueling of muscle with carbohydrates should begin as soon as possible following a match or a strenuous training session. Inadequate replacement of fluids lost in sweat can lead to poor soccer performance and heat illness. Players should aim to drink enough during training sessions and matches so that their body weights after play are within about 1 kg (2.2 lb) of their starting weights.  For a light workout or an easy match, especially when the weather is cool, water can be an adequate fluid replacement, if enough is ingested. But when play is strenuous and the weather is hot, carbohydrate-electrolyte sports drinks do a better job of maintaining body fluids. KEY POINTS Because so much of the running in soccer is at less than maximal sprinting speed, creatine supplementation likely provides no benefit to match performance. Overwhelming evidence proves that a diet rich in carbohydrates can fill muscles with glycogen, and glycogen is critical to optimal performance in soccer. Soccer players’ diets, especially in the days before hard training or competition, should include 8-10 grams of carbohydrate per kilogram of body weight (3.5-4.5 g / lb). Cereals, fruits, vegetables, breads, and pastas are good sources ofcarbohydrates. Refueling of muscle with carbohydrates should begin as soon as possible as possible following a match or a strenuous training session. Inadequate replacement of fluids lost in sweat can lead to poor soccer performance and heat illness. sessions and matches so that their body weights after play are within about 1 kg (2.2 lb) of their starting weights.  For a light workout or an easy m atch, especially when the weather is cool, water can be an adequate fluid replacement, if enough is ingested. if when play is strenuous and the weather is hot, carbohydrate-electrolyte sports drinks do a better job of maintaining body fluids.