This document discusses carbohydrates and their role in nutrition. It explains that carbohydrates provide the body with energy and are made up of carbon, hydrogen and oxygen. There are two types of carbohydrates - simple carbs like sugars and complex carbs like starches. Complex carbs have health benefits and can reduce the risk of diseases like diabetes and heart disease. The document emphasizes that not all carbohydrates are the same and eating whole foods as opposed to refined foods is important for health.