Reheated Pasta Boosts Gut Health via Resistant Starch

Reheating leftover pasta, potatoes, or rice can enhance gut health through starch retrogradation, a process where cooked starches cool and form resistant starch. Dietitian Julie Pace explains that this crystalline structure resists digestion, acting as a prebiotic that feeds beneficial gut bacteria. Fermentation produces butyrate, a short-chain fatty acid that nourishes colon cells, reduces inflammation, and improves regularity. According to The Johns Hopkins Patient Guide to Diabetes, resistant starch also lowers cholesterol, increases satiety, reduces blood sugar spikes, and may lower colon cancer risk. To maximize formation, cool cooked carbs in a refrigerator at 40°F or below for 12–24 hours, ensuring food safety by not leaving food at room temperature over two hours. Reheating retains most resistant starch, except in russet potatoes where content may slightly decrease. Other nutrients like protein, vitamins, and minerals remain largely unchanged. Natural sources include lima beans, kidney beans, sourdough bread, unripe bananas, and plantains.