This document summarizes the digestion and absorption of carbohydrates. It discusses that carbohydrates are broken down into monosaccharides in the mouth by salivary amylase, pass undigested through the stomach, and are further broken down in the small intestine by pancreatic amylase and intestinal disaccharidases into absorbable monosaccharides like glucose, fructose and galactose. These monosaccharides are then absorbed into the bloodstream through active transport using sodium-glucose transporters or facilitated diffusion using glucose transporters. Lactose intolerance results if the enzyme lactase is deficient and lactose cannot be fully digested.