Are Bananas High in Fibre? Everything You Need to Know

Are bananas high in fibre?

No, bananas aren’t considered especially high in fibre, although they are a useful source of it. With around 3g in a medium banana, they can contribute towards your recommended daily intake, but there are plenty of foods containing considerably more fibre.

Beans, lentils, chia seeds, whole grains and certain fruits all provide more fibre per serving. If you want to understand how different foods contribute to your daily intake, our Ultimate Guide to Fibre covers fibre sources, types of fibre and how much you should be eating.

Rather than relying on one food to reach your fibre target, aim to eat a variety of fibre sources throughout the day.

Are bananas good for your bowels?

Yes, bananas can be good for your bowels as part of a varied, fibre-rich diet. Their fibre contributes to normal bowel function, while the resistant starch found particularly in less-ripe bananas adds another interesting element for gut health.

However, bananas aren't a treatment for constipation and everyone's digestion is different. In fact, suddenly increasing your intake isn't always helpful, we explain more about whether too much fibre can cause constipation in our guide.

If you're increasing your fibre intake, do it gradually and remember to drink enough fluids.

Are green bananas good for gut health?

Green bananas may be particularly interesting for gut health because they contain more resistant starch than ripe bananas.

Resistant starch is a type of carbohydrate that resists digestion in the small intestine. This means some of it can reach the large intestine, where it can be fermented by gut bacteria.

In this sense, resistant starch can have prebiotic effects, providing a food source for certain beneficial bacteria.

When gut bacteria ferment resistant starch, they produce short-chain fatty acids (SCFAs), including butyrate. Butyrate is an important energy source for cells lining the colon and is an area of considerable interest in gut microbiome research.

As a banana ripens and turns from green to yellow and eventually brown, much of its resistant starch is converted into sugars. This is one reason why ripe bananas taste noticeably sweeter than green ones.

That doesn't mean you need to swap all your ripe bananas for green ones. Eating a variety of fibre-rich plant foods is more important than relying on one particular source of resistant starch.

What fruit has the most fibre?

Passion fruit is one of the most fibre-rich commonly available fruits, providing around 10g of fibre per 100g. Raspberries, avocados, blackberries and pears are also useful choices when you're looking to increase your fibre intake.

For comparison:

Fruit isn't your only option either. Seeds can pack a surprising amount into a small serving — take a look at our guide to [chia seeds and their gut health benefits] for another easy way to add fibre to meals.

How can you add more fibre to your diet?

The easiest way to eat more fibre is to gradually add a variety of plant foods across your meals and snacks.

For example, add banana, berries and chia seeds to porridge or overnight oats, swap white bread or pasta for wholegrain versions, add beans or lentils to meals and include different vegetables with lunch and dinner.

Instead of dramatically increasing your intake overnight, you can also try [fibre layering] — gradually adding different sources of fibre across your meals and snacks throughout the day. It's a gentler alternative to the social media trend of fibremaxxing, which focuses heavily on maximising the number of grams you eat.

The bottom line: are bananas high in fibre?

Bananas contain fibre, but they aren't one of the highest-fibre foods. A medium banana provides around 3g, so it can make a useful contribution towards the recommended 30g of fibre per day for UK adults.

Green bananas also contain resistant starch, which can reach the large intestine and be fermented by gut bacteria. As bananas ripen, their resistant starch content falls and more of that starch is converted into sugars.

For gut health, however, the bigger picture matters. Instead of relying on bananas alone, aim for a varied diet containing fruits, vegetables, whole grains, beans, pulses, nuts and seeds. If you're not sure where to start, our [Ultimate Guide to Fibre] breaks down the different types and the easiest ways to get more into your diet.

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