Sweet potato is a prebiotic goldmine — especially when cooked and cooled. The cooling process converts digestible starch into resistant starch, which passes through the small intestine and feeds colonic bacteria. The orange flesh is rich in beta-carotene, a powerful antioxidant that supports gut lining integrity and immune function.
Why it matters
Resistant Starch
Cooling after cooking creates resistant starch — a powerful fuel for butyrate-producing bacteria.
Beta-Carotene Rich
One medium sweet potato provides 400% of daily vitamin A needs via beta-carotene.
Gut Lining Support
Beta-carotene strengthens the intestinal mucus layer that protects against inflammation.
Fibre Dense
4g of fibre per medium potato, including both soluble and insoluble types.
How to eat it
Bake whole, cool, and use in salads for maximum resistant starch. Mash with a little butter and cinnamon. Make sweet potato wedges roasted with cumin and smoked paprika. Dice into grain bowls with tahini dressing.
Cooked-and-cooled sweet potato contains up to 4% resistant starch by weight, which selectively increases butyrate-producing bacteria including Faecalibacterium prausnitzii.
Source: Birt et al., Advances in Nutrition, 2013
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