Mwood: Created page with "{{PageHeader|type=Ingredient · Nutrition}} '''Resistant starch''' is a type of starch that the body cannot digest in the small intestine. Instead of being broken down into sugar and absorbed, it passes through to the large intestine (colon), where it is fermented by the "friendly" gut bacteria. Because of this, it behaves much more like dietary fibre than like ordinary starch, and it is often described as a '''prebiotic''' – a food for good gut bacteria. == What is..."

2026-11-05T11:40:51Z

Created page with "{{PageHeader|type=Ingredient · Nutrition}} '''Resistant starch''' is a type of starch that the body cannot digest in the small intestine. Instead of being broken down into sugar and absorbed, it passes through to the large intestine (colon), where it is fermented by the "friendly" gut bacteria. Because of this, it behaves much more like dietary fibre than like ordinary starch, and it is often described as a '''prebiotic''' – a food for good gut bacteria. == What is..."

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{{PageHeader|type=Ingredient · Nutrition}}

'''Resistant starch''' is a type of starch that the body cannot digest in the small intestine. Instead of being broken down into sugar and absorbed, it passes through to the large intestine (colon), where it is fermented by the "friendly" gut bacteria. Because of this, it behaves much more like dietary fibre than like ordinary starch, and it is often described as a '''prebiotic''' – a food for good gut bacteria.

== What is starch? ==
Starch is the main carbohydrate in foods such as potatoes, rice, bread, pasta, oats and beans. It is made of long chains of glucose (sugar). Most starch is quickly digested and turned into glucose, which raises blood sugar. Resistant starch is the small portion that "resists" this digestion.

== The four main types ==
Resistant starch is usually grouped into four types. A single food can contain more than one type.

{| class="wikitable"
! Type !! What it is !! Examples
|-
| '''Type 1''' || Starch locked inside the tough cell walls of plants, so digestive enzymes cannot reach it || Whole or partly milled grains, seeds, beans and lentils
|-
| '''Type 2''' || Starch whose natural structure is hard to digest when raw || Raw potato, green (unripe) bananas, plantains
|-
| '''Type 3''' || Starch that forms when a starchy food is cooked and then cooled (known as ''retrogradation'') || Cooked and cooled potatoes, rice and pasta
|-
| '''Type 4''' || Man-made starch that has been chemically modified to resist digestion || Some processed foods and food ingredients
|}

== How cooking affects it ==
How a food is prepared makes a big difference to how much resistant starch it contains:
* '''Ripening reduces it''' – as a banana ripens, its resistant starch turns into ordinary starch and sugar. Green bananas contain far more than yellow ones.
* '''Cooking reduces it''' – oats, green bananas and plantains lose some of their resistant starch when cooked. Green banana, plantain, cassava or potato starch flours also lose it when used for baking.
* '''Cooling increases it''' – cooking potatoes, rice or pasta and then chilling them (for example, overnight in the fridge) creates more resistant starch. Gently reheating appears to keep most of it, although the research is not completely settled.

'''Food safety tip:''' if cooling rice to increase resistant starch, cool it quickly (within an hour), keep it in the fridge, eat it within a day and only reheat it once.

== Possible health benefits ==
Most of the research is still developing, and results vary between people, doses and the type of resistant starch used. The main suggested benefits are:
* '''Gut health''' – gut bacteria ferment resistant starch to produce short-chain fatty acids, especially '''butyrate''', which is the main fuel for the cells lining the colon. It is thought to encourage more good bacteria and fewer bad ones.
* '''Blood sugar''' – because it is not digested into glucose, it causes a smaller rise in blood sugar than ordinary starch. Several studies have also shown improved insulin sensitivity, though not all studies agree.
* '''Feeling full''' – adding resistant starch to meals may help people feel fuller. It also provides fewer calories than ordinary starch (about 2 kcal per gram compared with 4 kcal per gram).
* '''Digestive regularity''' – like other fibres, it may help with constipation.

Claims about weight loss, cholesterol and bowel cancer risk are mostly based on early or animal studies and are not proven in people.

== Food sources ==
Good everyday sources include:
* Beans, peas and lentils (white beans and lentils are among the highest)
* Oats and barley, and other whole grains
* Green (unripe) bananas and plantains
* Potatoes, rice and pasta that have been cooked and then cooled
* Cashew nuts

== Supplements ==
Resistant starch is also sold as a powder, most commonly as '''raw potato starch''' or '''green banana flour'''. Raw potato starch provides roughly 8 g of resistant starch per tablespoon. Suggested approaches include sprinkling 1–2 teaspoons on food, or swapping part of the flour in a recipe for green banana or plantain flour (for uncooked uses).

== Side effects and cautions ==
* Start with a small amount and increase slowly – too much too soon can cause wind, bloating and discomfort.
* Drink plenty of water when increasing fibre intake.
* Very high intakes (above about 50–60 g a day) seem to offer no extra benefit.
* Anyone with diabetes, on blood sugar medication, or with a digestive condition should speak to their GP or a dietitian before making big changes to their diet or taking supplements.

== Labelling note ==
Staff should not make health claims for resistant starch on G&G labels or marketing unless the wording matches an authorised claim on the GB Nutrition and Health Claims Register and the product meets the conditions of use. Check with the Technical team before using any claim.

== References ==
# Healthline – ''Resistant Starch 101 – Everything You Need to Know'': https://www.healthline.com/nutrition/resistant-starch-101
# Johns Hopkins Diabetes Info – ''What is Resistant Starch?'': https://hopkinsdiabetesinfo.org/what-is-resistant-starch/
# NHS – ''Can reheating rice cause food poisoning?'': https://www.nhs.uk/common-health-questions/food-and-diet/can-reheating-rice-cause-food-poisoning/

[[Category:Ingredients]]

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