Athletes should consume 6–10 g of carbohydrate per kilogram of body weight each day. Protein is the primary component of muscular tissue. It also serves a variety of different purposes throughout the human body. Endurance athletes should consume 1.2 to 1.4 grams of protein per kilogram of body weight each day. Strength athletes should consume 0.7 to 0.9 grams of protein per kilogram of body weight each day. The amount of daily carbohydrate that an athlete needs will vary depending on several factors such as the type of sport they are playing, how much they are exercising, and what kind of diet they are using. For example, someone who is playing soccer multiple days per week with 30-minute games requires more energy than someone who is playing tennis once a week for an hour. An athlete who is playing at a high level of competition needs more energy than one who is not. The more intense the exercise, the more energy an athlete needs. Carbohydrates are the fuel that allows an athlete's body to play sports well. Therefore, athletes need to make sure that they are consuming enough carbohydrates each day to meet their energy requirements.