a chef scoops white powdery starch from freshly cut potatoes into a clear bowl. The starchy powder creates small clouds as it falls from the potato pieces. Meanwhile, white flour and rice grains spread across the wooden counter nearby. The starch settles into a pile showing its fine, white, granular texture. A family member watches from behind as the chef demonstrates how these white carbohydrates come from different food sources. white carbohydrate substances found in cereals, potatoes, and other common foods