Nutrition on game day is crucial to performance, fast-acting carbohydrates ensure that players have full glycogen reserves and also fast-acting glucose available to convert to energy, athletes should be getting water in at every chance Pre game, half time and at any break in play, dehydration by as little as 2% of body weight can affect performance and decision making, salt and electrolytes should be taken to replace the minerals lost through sweat. After games athletes need protein and carbs to start the recovery process.