This document discusses carbohydrates and provides an overview of the basics. It explains that carbohydrates come in different forms including monosaccharides, disaccharides, polysaccharides, and fiber. Carbohydrates are an important source of fuel and provide glucose to the body and brain. While simple carbohydrates like sugar are small molecules, complex carbohydrates like starches are larger polysaccharide molecules. The document recommends obtaining 55-65% of daily calories from carbohydrates, with no more than 20% from added sugars, and choosing whole grains, fruits, vegetables, beans and peas as healthy carbohydrate sources.