The main portion of the Nutrient Balance Indicator is a special type of radial graph. It's very similar to a bar graph, but instead of having horizontal or vertical bars, the bars (or "spokes") of this graph extend outward from the center. Each spoke represents a different essential nutrient, and is grouped into one of five color-coded categories - Dietary Fiber (green), Protein (blue), Vitamins (purple), Minerals (white), and potentially troublesome nutrients (yellow).