Refrigerating cooked pasta for at least 24 hours converts its digestible starches into
resistant starch through a process called retrogradation. This type of starch resists digestion in the small intestine, acting more like fiber, which results in a significantly lower blood sugar spike—sometimes by up to 50%—compared to freshly cooked pasta.
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Why Chilled/Leftover Pasta is Better for Blood Sugar:
- Resistant Starch Formation: Cooling pasta (and rice or potatoes) causes starch molecules to reorganize into a tighter, crystalline structure that enzymes cannot easily break down into glucose.
- Lower Glucose Impact: Because the starch is not as easily digested, it causes a smaller, more gradual increase in blood glucose rather than a sharp surge.
- Effect Lasts After Reheating: Reheating previously cooled pasta does not destroy all the beneficial resistant starch, meaning it remains a better, lower-calorie option than fresh pasta.
- Added Health Benefits: The resistant starch passes into the large intestine, where it acts as a prebiotic, feeding beneficial gut bacteria.
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For the best results, cook the pasta, refrigerate it for at least 24 hours, and consume it cold or gently reheated.