Final answer:
Carbohydrates are organic compounds that provide energy and have various important functions. They are obtained from grains, fruits, and vegetables, and are commonly used by athletes for high-performance energy.
Step-by-step explanation:
Carbohydrates are organic compounds made up of simple sugars. They provide energy to the body, particularly through glucose. Carbohydrates also have other important functions, such as cell recognition, acting as lubricants, and controlling blood glucose and cholesterol. Grains, fruits, and vegetables are natural sources of carbohydrates. Athletes often rely on carbohydrate-rich foods for high-performance energy.