Updated May 2026.
Resistant starch is a type of carbohydrate that resists digestion in the small intestine and reaches the large intestine, where it can be fermented by gut bacteria. It is found in foods such as lentils, beans, oats, green bananas, and cooked-and-cooled potatoes, rice or pasta. It is one of the reasons starchy foods can be part of a gut-supportive, balanced diet.
What is resistant starch?
Most starch is broken down into glucose during digestion. Resistant starch behaves differently. It passes through the small intestine largely undigested and is then fermented in the colon. In practical terms, it sits somewhere between starch and fibre: it comes from carbohydrate-rich foods, but it has fibre-like effects in the gut.
Why it matters for gut health
When resistant starch is fermented by gut bacteria, it can produce short-chain fatty acids, including butyrate. These compounds are studied for their role in colon cell metabolism, gut barrier function and the wider gut environment. This does not mean resistant starch is a cure or a single solution. It means it is a useful part of a varied, fibre-containing diet.
The cooking and cooling effect
One of the most practical things about resistant starch is that food preparation changes how much is present. When potatoes, rice or pasta are cooked and then cooled, some of the starch changes structure through a process called retrogradation. This can increase the amount that resists digestion. Reheating may reduce some of it, but does not necessarily remove it all.
Foods that contain resistant starch
Useful sources include lentils, chickpeas, butter beans, kidney beans, oats, green bananas, cooled cooked potatoes, cooled cooked rice and cooled cooked pasta. The exact amount varies by variety, ripeness, cooking method, cooling time and portion size, so it is better to think in patterns rather than trying to calculate every gram.
How to include it without overthinking it
Make a lentil salad with herbs and olive oil. Add chickpeas to a tray bake. Use oats at breakfast. Cook potatoes or rice ahead and serve them cooled or gently reheated. Choose pulse-based meals a few times a week. These are ordinary food habits, not specialist interventions.
Where Kurami fits
Kurami’s food philosophy has always made space for intelligent starches: pulses, grains, roots and vegetables used in a balanced way. Resistant starch is one part of that picture, alongside plant diversity, protein, fats, colour and flavour. We do not remove carbohydrates to make food sound healthier; we choose the right sources and use them with purpose.
FAQs
Is resistant starch the same as fibre?
It is often discussed alongside fibre because it resists digestion and is fermented in the large intestine, but it is technically a type of starch with fibre-like properties.
Is cooled rice better than hot rice?
Cooled cooked rice can contain more resistant starch than freshly cooked hot rice. That does not make hot rice “bad”. It simply means preparation can shift the nutritional profile.
Can resistant starch cause bloating?
It can for some people, especially if fibre intake is increased quickly. Start gradually and drink enough fluids. People with IBS or sensitive digestion may need more personalised advice.
References:
Birt DF et al. Resistant starch: promise for improving human health. Advances in Nutrition. 2013.
Written by the Kurami Team.
