Most starch is broken down into glucose and absorbed in the small intestine. A portion, however, makes it all the way to the large intestine intact. That fraction is called resistant starch, and once it arrives, it behaves much like a fermentable fibre.
The main types
- RS1: physically trapped in whole grains, seeds and legumes.
- RS2: naturally resistant granules, as in raw potato starch and green bananas.
- RS3: “retrograded” starch that forms when cooked starchy foods such as potatoes, rice or pasta are cooled.
- RS4 and RS5: chemically modified or starch–lipid forms used in food manufacturing.
Why gut bacteria care
In the colon, resistant starch is fermented by bacteria, producing short-chain fatty acids, particularly butyrate, which is a key energy source for the cells lining the colon. That’s why resistant starch is classed as a prebiotic.
Easy ways to eat more
- Cook potatoes or rice, cool them in the fridge, and eat them cold or gently reheated.
- Add beans, lentils and chickpeas to meals a few times a week.
- Choose oats and whole grains.
- Try a slightly under-ripe banana.
What the research says
Studies have looked at resistant starch in relation to blood sugar responses, fullness and gut fermentation, usually at doses of several grams to tens of grams per day. Results have been mixed: some measures improve in some studies, others don’t. Sodatide contains 100 mg of potato resistant starch per capsule, a small amount compared with research doses or with what a starchy meal can supply, so food sources remain important.
Tip: increase resistant starch gradually. Like other fibres, a sudden increase can cause gas while your gut bacteria adjust.
Learn more about Sodatide: see what’s in each capsule, how to take it, or the related focus area, Satiety & Appetite.
This article is for general education and is not medical advice. Talk to a qualified healthcare professional about your own health, medications or supplements.
