How Much Fibre Do You Need Per Day?
Australian adequate intake recommendations for adults are approximately 25 grams of fibre per day for women and 30 grams per day for men. Individual needs can vary according to age, diet, health and life stage.
Rather than focusing only on a number, aim to obtain fibre from a variety of vegetables, fruit, legumes, whole grains, nuts and seeds.
What Is Dietary Fibre?
Dietary fibre is the part of plant foods that is not completely digested in the small intestine. It passes into the large intestine, where different fibres can influence bowel function and may be fermented by gut bacteria.
Fibre is naturally found in foods including:
- Vegetables
- Fruit
- Legumes such as lentils, chickpeas and beans
- Whole grains
- Nuts
- Seeds
Different foods provide different types of fibre, which is why variety matters.
Soluble vs Insoluble Fibre: What’s the Difference?
Fibre is commonly discussed as either soluble or insoluble, although many plant foods contain a combination of both.
Soluble Fibre
Soluble fibre absorbs water and can form a gel-like substance within the digestive tract. Some forms are also fermented by bacteria within the large intestine.
Sources of soluble fibre include:
- Oats
- Barley
- Beans and lentils
- Chia seeds
- Flaxseeds
- Apples
- Citrus fruit
- Carrots
- Psyllium
Insoluble Fibre
Insoluble fibre does not dissolve in water. It contributes bulk to stools and can help support normal bowel movements.
Sources include:
- Whole grains
- Wheat bran
- Nuts and seeds
- Vegetable skins
- Broccoli
- Cauliflower
- Green beans
- Leafy vegetables
What Are the Best High-Fibre Foods?
You do not need specialist fibre products to build a high-fibre diet. Some of the most useful sources are ordinary whole foods.
Legumes
Lentils, chickpeas, black beans, kidney beans and other legumes can provide substantial amounts of fibre as well as plant-based protein.
Whole Grains
Oats, barley, brown rice, quinoa and wholegrain breads and cereals can help increase daily fibre intake.
Vegetables
Broccoli, carrots, leafy greens, sweet potato, peas and other vegetables contribute different fibres as well as vitamins, minerals and plant compounds.
Fruit
Berries, pears, apples, kiwi fruit, oranges and other whole fruits provide fibre. Where appropriate, eating edible skins can further increase fibre intake.
Nuts and Seeds
Chia seeds, flaxseeds, almonds, pumpkin seeds and other nuts and seeds are easy ways to add fibre to meals and snacks.
Fibre and Constipation
Fibre can play an important role in bowel regularity, but constipation is not always simply caused by “not enough fibre”.
Fluid intake, physical activity, medications, pelvic floor function, dietary patterns and medical conditions can also influence bowel habits.
For some people, increasing fibre too rapidly can actually lead to more bloating, gas or abdominal discomfort.
If you currently eat very little fibre, increasing your intake gradually and drinking adequate fluids may be more comfortable than making a dramatic change overnight.
Fibre and Your Gut Microbiome
Some types of dietary fibre can be fermented by bacteria living in the large intestine. These fibres are sometimes referred to as prebiotic fibres when they are selectively used by microorganisms in a way that provides a health benefit.
Fermentation can produce compounds known as short-chain fatty acids (SCFAs), including acetate, propionate and butyrate.
This is one reason eating a diverse range of plant foods can be useful: different plants provide different fibres and substrates for the intestinal microbiome.
If you are experiencing persistent digestive symptoms, learn more about our
gut health approach
.
What Are Prebiotic Foods?
Prebiotics are substrates that are selectively used by microorganisms and provide a health benefit. Many commonly discussed prebiotic compounds are types of dietary fibre.
Foods that can provide prebiotic fibres include:
- Onion
- Garlic
- Leeks
- Asparagus
- Legumes
- Oats
- Barley
- Green or less-ripe bananas
However, some highly fermentable foods can increase symptoms in people with sensitive digestive systems. More fibre is therefore not automatically better for every person.
Fibre, Resistant Starch and Gut Health
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.
Sources can include legumes, green bananas and certain cooked and cooled starchy foods such as potatoes and rice.
Resistant starch can form part of a varied fibre-rich diet, although individual tolerance varies.
Can Fibre Help With Cholesterol?
Certain soluble fibres, including beta-glucan found in oats and barley, can contribute to healthy cholesterol management when consumed as part of an overall healthy dietary pattern.
This does not mean every type of fibre has exactly the same effect. The food source, fibre type and overall diet matter.
Can You Eat Too Much Fibre?
Yes. Increasing fibre too quickly can cause symptoms such as:
- Bloating
- Gas
- Abdominal discomfort
- Changes in bowel movements
- Feeling excessively full
This is particularly relevant if you suddenly introduce large quantities of legumes, bran, fibre supplements or highly fermentable foods.
Increasing fibre gradually gives your digestive system time to adjust.
How Can I Eat More Fibre?
You don’t need to completely redesign your diet. Start with small, sustainable changes.
- Add berries, chia seeds or nuts to breakfast.
- Choose wholegrain bread or oats instead of highly refined cereals.
- Add lentils or beans to soups, curries and salads.
- Include vegetables with both lunch and dinner.
- Choose whole fruit rather than relying primarily on juice.
- Add seeds or nuts to yoghurt or salads.
- Experiment with legumes several times per week.
Increasing your intake slowly can be particularly important if your current diet is low in fibre.
Why Does Fibre Sometimes Make Bloating Worse?
If you have been told to “eat more fibre” but feel increasingly bloated every time you do, the answer may not be simply adding even more.
Different fibres are fermented differently, and tolerance can vary considerably between individuals. Digestive symptoms can also have many causes unrelated to fibre intake.
Persistent bloating, abdominal pain, constipation or diarrhoea deserves appropriate assessment rather than continually restricting or adding foods without understanding why symptoms are occurring.
Do You Need a Fibre Supplement?
Not everyone needs a fibre supplement. Wherever practical, a varied whole-food diet can provide multiple types of fibre alongside other nutrients.
In some circumstances, a practitioner may recommend a specific fibre such as psyllium or another targeted fibre product. The appropriate choice depends on the reason it is being used and your individual tolerance.
If you have a gastrointestinal condition, significant bowel symptoms or take medications, discuss fibre supplementation with an appropriately qualified healthcare professional.
Personalised Nutrition Support in Brisbane
If you’re eating what seems like a healthy diet but are still struggling with constipation, bloating, irregular bowel movements or uncertainty about what foods suit you, a personalised nutrition assessment can help make your next steps clearer.
At Morkare Natural Clinic, our clinical nutrition practitioners consider your current diet, symptoms, health history, food preferences and goals before developing practical recommendations.
Rather than giving everyone the same high-fibre diet, we look at what your body needs and what you can realistically maintain.
Learn more about our
Clinical Nutritionist Brisbane
service.
In-clinic consultations are available in Holland Park West, Brisbane, with telehealth consultations available Australia-wide.
Frequently Asked Questions About Fibre
How much fibre should I eat per day?
Australian adequate intake recommendations are approximately 25 grams per day for adult women and 30 grams per day for adult men. Requirements differ according to age, sex and life stage.
What foods are highest in fibre?
High-fibre foods include legumes, whole grains, vegetables, fruit, nuts and seeds. Rather than relying on one food, eating a variety of plant foods provides different types of dietary fibre.
What is the difference between soluble and insoluble fibre?
Soluble fibre can absorb water and form a gel, while insoluble fibre contributes bulk to stools. Many plant foods naturally contain a mixture of different fibre types.
Does fibre help constipation?
Fibre can support bowel regularity, but constipation can have many causes. The amount and type of fibre, fluid intake, physical activity, medications and underlying health conditions can all influence bowel function.
Why does fibre make me bloated?
Some fibres are readily fermented by gut bacteria and can increase gas, particularly when intake is increased rapidly. Persistent or significant bloating should be assessed rather than assuming fibre is the only cause.
Should I take a fibre supplement?
Not necessarily. Many people can obtain adequate fibre through food. Specific fibre supplements may be useful in certain circumstances, but the appropriate type and amount depends on individual needs.
What is the best fibre for gut health?
There is no single best fibre for everyone. A varied diet containing vegetables, fruit, legumes, whole grains, nuts and seeds provides multiple fibre types and is generally preferable to relying on one source.
Should I increase fibre quickly?
Usually not. If your current intake is low, increasing fibre gradually while maintaining adequate fluid intake may reduce the likelihood of bloating and digestive discomfort.
Important Information
This information is general educational information and does not replace individual medical or dietary advice. Persistent constipation, diarrhoea, abdominal pain, rectal bleeding, unexplained weight loss or significant changes in bowel habits should be discussed with an appropriate healthcare professional.