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Starch and Stomach Expansion: What You Need to Know
Starch does not expand in the stomach. This is a common misconception.
Digestion Process
- Oral: Salivary amylase begins starch breakdown.
- Gastric: Amylase inactivated by acid. Minimal starch digestion in stomach.
- Small intestine: Pancreatic amylase, brush-border enzymes (maltase, sucrase-isomaltase) → glucose → absorption.
Why You Feel Full/Bloated
- Fiber: Co-consumed with starchy foods (whole grains, legumes) — holds water, ferments → gas.
- Water: Starch-rich meals often include fluids.
- Gas production: Fermentation of resistant starch/fiber by colonic bacteria.
- Gastric distension: Volume of food/liquid, not starch swelling.
Resistant Starch
Escapes small intestinal digestion → colonic fermentation → SCFAs (beneficial). Does not expand in stomach.
Postprandial fullness is physiologic, not due to starch expansion.
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