Carbohydrate absorption in gastrointestinal tract

"Carbohydrate absorption in the gastrointestinal tract" is **not a single molecule or receptor**, but rather describes the physiological process by which dietary carbohydrates are digested into monosaccharides—primarily glucose, galactose, and fructose—and then absorbed across the small intestinal epithelium. This process involves several key steps: 1. **Enzymatic digestion** begins with salivary amylase in the mouth and continues with pancreatic amylase and brush border enzymes in the small intestine[2][3][6]. 2. **Absorption** occurs mainly in the small intestine via specific transporters on enterocytes: - Glucose and galactose are absorbed by secondary active transport through SGLT1 (sodium-glucose co-transporter 1)[3]. - Fructose is absorbed via facilitated diffusion through GLUT5[3]. - All three monosaccharides exit enterocytes into portal blood via GLUT2. 3. The liver processes these sugars further before they reach systemic circulation. This physiological pathway can be therapeutically targeted at various points—for example, by inhibiting alpha-glucosidases to slow breakdown of complex carbohydrates—but "carbohydrate absorption" itself is not a discrete molecular entity or canonical drug target[4]. Instead, individual proteins involved—such as SGLT1 or GLUT5—are considered true molecular targets. Therefore, this entry should be flagged as incorrect for use as a canonical drug target; it refers to an entire biological process rather than a specific molecule or receptor suitable for structured pharmacological targeting[3][4].

Other names

Intestinal carbohydrate absorptionSmall intestine carbohydrate uptakeMonosaccharide absorption in gut

Inhibition of intestinal disaccharidases to delay monosaccharide formation and reduce glucose uptake[4]