Introduction

Fibre is one of those nutrients most people know they should eat more of, but it can be easy to overlook in everyday meals.

Unlike sugars and starches, much of dietary fibre is not broken down and absorbed in the same way as other carbohydrates.

Instead, it travels through the digestive system and contributes to healthy bowel function while different types of fibre have additional effects on blood sugar, cholesterol and fullness.

HealthHub notes that fibre can slow carbohydrate digestion and glucose absorption, while high-fibre foods include vegetables, fruit and wholegrain products.

The good news is that getting more fibre usually does not require unusual foods or expensive supplements. Everyday plant foods can provide plenty.

Dietary fibre is found mainly in plant foods.

It includes parts of plants that resist digestion in the small intestine and reach the large intestine largely intact or partially fermented.

This gives fibre functions that are different from other carbohydrates.

Some types help add bulk to stools. Others absorb water or are fermented by bacteria living in the gut.

Whole plant foods usually contain a mixture of different fibre types rather than only one.

That is one reason eating a variety of vegetables, fruit, legumes and wholegrains is more useful than focusing on one supposed “super-fibre” food.

Dietary fibre is commonly discussed as soluble and insoluble fibre.

HealthHub explains that soluble fibre absorbs water and forms a gel-like substance as it moves through the digestive system. Sources include oats, barley, beans, peas, apples, oranges and root vegetables.

Insoluble fibre does not dissolve in water in the same way and helps add bulk to stools.

Wholegrains, vegetables, nuts, seeds and the skins of some fruits can provide insoluble fibre.

You generally do not need to calculate how many grams of each type you eat.

A varied plant-rich diet usually provides both.

One of fibre's best-known benefits is supporting regular bowel movements.

Fibre can increase stool bulk and help stool move through the digestive tract more effectively.

HealthHub recommends increasing dietary fibre as part of preventing constipation, together with adequate fluids and regular movement.

But fibre works best when there is enough fluid available.

Increasing fibre substantially while drinking very little may make bowel symptoms uncomfortable for some people.

Regular physical activity also supports normal bowel function.

Does Fibre Feed Your Gut Bacteria?

Some types of fibre and related carbohydrates can be fermented by bacteria living in the large intestine.

This fermentation produces compounds that may support the environment of the colon.

Different plant foods provide different fermentable fibres, which is another reason dietary variety can be useful.

However, suddenly eating very large quantities of fermentable fibre can also increase gas and bloating, particularly in people who are not accustomed to it.

Fibre can also influence how quickly carbohydrates are digested and absorbed.

HealthHub explains that dietary fibre can slow carbohydrate digestion and glucose absorption, helping support blood sugar control.

This is one reason wholegrain foods, legumes, vegetables and whole fruit generally affect the body differently from highly refined carbohydrate foods.

Certain soluble fibres can also help reduce absorption of cholesterol in the digestive tract and support healthy cholesterol levels.

Fibre-rich foods tend to require more chewing and can help meals feel more satisfying.

That does not mean fibre automatically causes weight loss, but higher-fibre foods can be useful within a balanced eating pattern.

Fibre is naturally abundant in plant foods.

Useful sources include:

• Vegetables
• Whole fruits
• Beans, lentils and peas
• Oats and barley
• Wholemeal bread
• Brown rice and other wholegrains
• Nuts and seeds
• Wholegrain noodles and cereals

WHO recommends dietary patterns containing vegetables, fruits, legumes, nuts, seeds and whole grains — all important sources of fibre.

HealthHub's My Healthy Plate similarly recommends including wholegrains as part of meals and notes that they provide more fibre than refined grains.

You do not have to replace every grain with brown rice immediately. Small swaps across the day can add up.

Whole Fruit or Fruit Juice?

Whole fruit generally retains substantially more fibre than juice.

The fibre in whole fruit also slows eating and makes the food more filling.

Juice can contain vitamins, but it is much easier to drink the equivalent of several pieces of fruit quickly.

For everyday intake, eating whole fruit is usually the better way to obtain both nutrients and fibre.

Exact fibre recommendations can vary according to age, sex and national guidelines.

SingHealth notes a commonly recommended target of around 30 grams of dietary fibre per day and reports that average intake in Singapore is considerably lower.

Rather than becoming overly focused on calculating every gram, you can use food patterns as a practical guide.

Include vegetables at main meals, eat whole fruit regularly, choose wholegrains more often and include legumes, nuts or seeds across the week.

WHO's healthy-diet guidance likewise emphasises eating a wide variety of fruits, vegetables, whole grains, legumes, nuts and seeds.

People with particular medical conditions may have different fibre needs, so individual advice can still matter.

Going from a very low-fibre diet to an extremely high-fibre diet overnight can cause bloating, gas and abdominal discomfort.

SingHealth specifically recommends increasing fibre gradually over a period of time to reduce bloating from excessive gas.

Add one or two changes at a time instead.

For example, switch breakfast cereal first, then add beans to one or two meals the following week.

Drink enough fluids as your fibre intake rises.

If increasing fibre consistently causes severe pain, diarrhoea or significant bloating, discuss it with a healthcare professional rather than forcing yourself to continue.

Do You Need a Fibre Supplement?

Fibre supplements can be useful in certain situations, but whole foods have advantages.

Vegetables, fruit, legumes and wholegrains provide vitamins, minerals and other plant compounds in addition to fibre.

Supplements may be recommended for specific bowel problems or when food intake is insufficient.

If you take regular medicines, ask a pharmacist or healthcare professional whether a fibre supplement should be separated from your medication because some products can affect absorption.

You do not need to redesign every meal.

Start with familiar foods and make small adjustments.

Choose wholemeal bread for some sandwiches. Add oats to breakfast. Include beans or lentils in soups, curries or stews.

Add an extra vegetable to noodle or rice dishes.

Snack on whole fruit instead of relying mainly on juice.

Use nuts or seeds in sensible portions as toppings for yoghurt, oats or salads.

HealthHub also encourages wholegrain options because refined grains lose much of their bran and germ during processing and therefore contain less fibre.

Fibre Works Best as Part of a Balanced Diet

Fibre deserves attention, but one nutrient cannot make an entire diet healthy.

Your body also needs adequate protein, healthy fats, vitamins, minerals and overall energy.

WHO's current healthy-diet guidance emphasises variety across vegetables, fruits, whole grains, legumes, nuts, seeds and appropriate protein foods rather than relying on one nutrient in isolation.

The easiest long-term strategy is therefore not to chase a fibre number with supplements.

Build more minimally processed plant foods into meals you already enjoy.