UNIT 2 Carbohydrates Carbohydrates: Composition, Classification, Functions, Sources, and Recommended Daily Allowances Introduction Carbohydrates are the primary source of energy for the body. They are organic compounds made up of carbon (C), hydrogen (H), and oxygen (O), usually in a 1:2:1 ratio. Carbohydrates are essential for energy production, brain function, and metabolism. Composition of Carbohydrates Carbohydrates are composed of three main types based on their chemical structure: 1. Sugars (Simple