This document summarizes key aspects of carbohydrate metabolism. It discusses the digestion of carbohydrates in the mouth, stomach, and small intestine. The primary site of digestion is the small intestine by pancreatic enzymes and brush border enzymes. Glucose and other monosaccharides are then absorbed into blood. The document also outlines several major pathways involved in carbohydrate metabolism including glycolysis, the citric acid cycle, glycogen synthesis and breakdown, and gluconeogenesis. Hormonal regulation of carbohydrate metabolism by insulin, glucagon, and epinephrine is also summarized.