Dr. Matt and Dr. Mike's Medical Podcast Carbohydrate Digestion & Absorption
4 snips
Jul 26, 2025 Discover how we break down carbohydrates like starch and glycogen into simple sugars such as glucose and fructose. Learn about the role of enzymes in digestion and the intriguing link between Gatorade and hydration. The podcast explores various carbohydrate structures, why some are digestible while others, like cellulose, aren't. It even touches on lactose intolerance and genetic variations around the world. Personal anecdotes and practical tips round out this insightful discussion on our body's sugar processing abilities.
AI Snips
Chapters
Transcript
Episode notes
Monosaccharides Are The End Goal
- Carbohydrates are ingested mainly as polysaccharides and must be broken to monosaccharides for absorption.
- The three absorbable monosaccharides are glucose, fructose, and galactose.
Bond Type Determines Digestibility
- Starch and glycogen contain alpha-1,4 and alpha-1,6 bonds while cellulose has beta-1,4 bonds which human enzymes can't cleave.
- That structural difference explains why humans digest starch/glycogen but not cellulose (fiber).
Amylase Starts In Mouth, Peaks In Pancreas
- Salivary and pancreatic alpha-amylases cleave alpha-1,4 bonds to shorten polysaccharides into oligosaccharides.
- Pancreatic amylase is more potent and continues luminal digestion in the duodenum.