Fibre for Women: Why It Matters More Than You Might Think

Quick Answer

UK guidance recommends an average intake of around 30 g of fibre a day for adults aged 16 and over (GOV.UK). Yet most of us are nowhere near it.

The latest UK National Diet and Nutrition Survey found that adults aged 19–64 consumed an average of just 16.4 g per day, and only 4% of adults met the recommendation (GOV.UK).

Fibre matters for much more than avoiding constipation. Higher-fibre diets are associated with better bowel, cardiovascular and digestive health, blood glucose regulation, and long-term risk profiles for several chronic diseases.

Different fibres also behave differently. Some add bulk, some hold water, some form gels and some are fermented by gut bacteria. Rather than searching for one perfect type of fibre, the practical goal is to eat a variety of fibre-rich plant foods regularly: beans, lentils, chickpeas, vegetables, fruit, wholegrains, nuts and seeds.

What You’ll Learn

In this guide:

• what fibre actually is
• how much women need
• why most UK adults are not getting enough
• why fibre matters beyond digestion
• what fibre does for your gut microbiome
• how fibre can support heart and metabolic health
• whether fibre becomes more important in midlife
• whether fibre can help with weight management
• soluble versus insoluble fibre
• whether you need a fibre supplement
• how to reach 30 g without completely changing your diet
• why increasing fibre too quickly can leave you feeling worse rather than better

Fibre Deserves a Better Reputation

Mention protein and people immediately think: muscle. Mention omega-3 and they think: heart and brain. Mention fibre and most people think: going to the toilet.

That is doing fibre a considerable disservice. Regular bowel movements certainly matter, but fibre sits at the intersection of several areas that are highly relevant to healthy ageing, including digestive, cardiovascular and metabolic health.

Large bodies of evidence associate higher fibre consumption with lower rates of coronary heart disease, stroke, type 2 diabetes and colorectal cancer (PubMed). And yet it is something most of us are not eating enough of. Not because fibre is difficult to find, but often because modern diets have gradually moved away from many of the foods that naturally contain it.

What Actually Is Fibre?

Dietary fibre is a broad group of carbohydrates found predominantly in plant foods that are not digested and absorbed in the small intestine in the same way as sugars and starches. UK scientific guidance defines dietary fibre as carbohydrates that are neither digested nor absorbed in the small intestine, with specific structural criteria, plus lignin (GOV.UK).

That technical definition matters to researchers. For everyday eating, a simpler way to think about it is: fibre is the part of plant foods that travels through much of your digestive system without being completely broken down by your own digestive enzymes.

But it doesn't simply pass through doing nothing. Different fibres can:

• absorb water
• add bulk to stools
• form gels
• slow aspects of digestion
• influence cholesterol
• be fermented by gut microbes

This is why talking about “fibre” as though it were one substance can be misleading.

Soluble vs Insoluble Fibre

You may have heard fibre divided into two groups.

Soluble fibre

Some soluble fibres dissolve or swell in water and can form a gel-like material. Sources include oats, barley, beans, lentils, peas, fruit and psyllium. Certain soluble fibres have particular effects on blood cholesterol and post-meal glucose responses.

Insoluble fibre

Insoluble fibres do not dissolve readily in water and can contribute bulk to stools. Sources include wholegrain cereals, wheat bran, vegetables, nuts and seeds.

But this classification isn't perfect. Foods contain mixtures of different fibres, and fermentability, viscosity and other properties can sometimes tell us more about how a fibre behaves than simply calling it soluble or insoluble. That is another reason variety matters.

How Much Fibre Do Women Need?

In the UK, the recommendation for adults aged 16 and over is an average population intake of approximately 30 g per day. Importantly, this isn't a special target just for women. It is the UK adult population recommendation (GOV.UK).

You may see lower numbers on American websites because different countries use different definitions and dietary reference systems. For a UK audience, 30 g a day is the useful benchmark.

Are We Actually Getting 30 g?

Most of us aren't even close. According to the UK National Diet and Nutrition Survey covering 2019–2023, average fibre intake was:

Age group	Average daily fibre intake
Adults 19–64	16.4 g
Adults 65–74	16.9 g
Adults 75+	16.4 g

Only 4% of adults met the fibre recommendation (GOV.UK). That is striking. The average adult is getting only a little over half the recommended amount.

So before worrying about obscure superfoods or the latest longevity ingredient, there is a very ordinary question worth asking: Am I eating enough plants?

Why Does Fibre Matter for Healthy Ageing?

Healthy ageing is rarely about one dramatic intervention. It is built through habits that quietly influence health over decades. Fibre is a perfect example.

A major series of systematic reviews and meta-analyses published in The Lancet examined data from observational studies and clinical trials involving carbohydrate quality. Higher fibre intake was associated with lower rates of coronary heart disease, stroke, type 2 diabetes and colorectal cancer, alongside favourable effects on several cardiometabolic measures in trials. The analysis suggested that approximately 25–29 g or more per day was associated with substantial health benefits (PubMed).

This doesn't mean fibre is a magic shield against disease. High-fibre diets also tend to contain more whole plant foods and may reflect broader dietary patterns. But taken together with controlled research on specific physiological effects, the evidence supporting fibre-rich diets is strong enough that UK dietary recommendations explicitly encourage higher intake (GOV.UK).

Fibre and Your Gut

This is perhaps fibre's most famous job. But even here, there is more happening than simply “keeping you regular”. Some fibres increase stool bulk, retain water, alter stool consistency and influence intestinal transit. Others are fermented by bacteria living in the large intestine. And this brings us to one of the most interesting areas of modern nutrition.

Fibre Feeds Your Gut Microbiome

Your large intestine contains an enormous community of microorganisms. Collectively, this ecosystem is known as the gut microbiome.

Certain fibres can act as substrates for particular gut bacteria. When bacteria ferment these carbohydrates, they can produce compounds including short-chain fatty acids, such as acetate, propionate and butyrate. These compounds have roles within the gut environment and are an active area of research across metabolism, immunity and intestinal health.

You will sometimes hear this simplified into: “Fibre feeds your good bacteria.” That is useful as a starting point, but the biology is more complex. Different fibres favour different microbes. Different people have different microbiomes. And not every fibre is fermented in the same way.

The practical conclusion is refreshingly simple: eat a variety of plant foods rather than relying on one fashionable prebiotic ingredient.

Fibre and Constipation

Here the evidence becomes very practical. The NHS recommends a fibre-rich diet as part of supporting healthy digestion and preventing constipation, alongside adequate fluid intake (NHS).

A 2022 systematic review and meta-analysis examined 16 randomised controlled trials involving 1,251 adults with chronic constipation. Overall, 66% of participants receiving fibre responded to treatment compared with 41% in control groups. Fibre supplementation also improved stool frequency and consistency, although effects differed according to the type and amount of fibre used. Psyllium had particularly useful evidence (PubMed).

There was, however, a familiar side effect: more flatulence. Which brings us to an important point.

Why Eating More Fibre Can Make You Bloated

Someone hears, “I need 30 g of fibre.” So overnight they swap white toast for bran cereal, add a huge lentil salad, eat three pieces of fruit, add chia seeds and start putting beans into everything. By day three, their digestive system is protesting.

This does not necessarily mean fibre “doesn't agree with you”. Your gut may simply need time to adjust. The NHS recommends increasing fibre gradually if you're not accustomed to a high-fibre diet. Increasing fluid intake alongside fibre is also important, particularly with fibres that absorb water (NHS).

Think: build, don't bombard.

Fibre and Heart Health

This is one of the most important reasons to stop thinking of fibre purely as a digestive nutrient. Certain fibres, particularly viscous soluble fibres such as beta-glucan, can influence cholesterol metabolism. At a broader dietary level, higher fibre consumption is consistently associated with better cardiovascular outcomes (PubMed).

Fibre-rich foods also tend to bring other useful things with them. Oats bring beta-glucan. Beans bring protein and minerals. Fruit and vegetables bring micronutrients and phytochemicals. Nuts and seeds bring unsaturated fats.

This is why food-first nutrition is so powerful. You rarely eat a nutrient in isolation.

Fibre and Blood Sugar

Fibre can also influence the way carbohydrates are digested and absorbed. Certain fibres slow digestion and can reduce the size of post-meal blood glucose rises. Over the long term, diets higher in fibre are associated with a lower risk of type 2 diabetes (PubMed).

That becomes particularly relevant when we think about metabolic health as women age. If you'd like to understand that wider picture, we explore it in Why Your Metabolism Changes as You Age and What You Can Actually Do About It.

But it is worth being precise. Adding a spoonful of fibre does not somehow cancel out an otherwise poor diet. Again, the whole dietary pattern matters.

Fibre, Weight and Appetite

Can fibre help with weight management? Potentially. High-fibre foods can often increase chewing, meal volume and fullness. Certain fibres also slow gastric emptying or influence appetite through their physical and fermentative properties.

But we would not describe fibre as a weight-loss ingredient. A bowl of lentils isn't a fat burner. Fibre simply helps create the kind of dietary pattern that may make appetite and energy intake easier to manage for some people. This is a much more useful way to think about it.

What About Fibre During Perimenopause and Menopause?

This is where fibre becomes especially relevant to the Nibu audience. Menopause does not suddenly create a unique new fibre requirement. The UK adult recommendation remains approximately 30 g per day (GOV.UK).

But midlife can change the health priorities around that recommendation. Women may become more conscious of cardiovascular health, cholesterol, blood glucose, body composition, bowel regularity and gut health.

Fibre-rich foods can support several of these areas within an overall healthy diet. This doesn't make fibre a “menopause treatment”. It makes it one of the ordinary nutritional foundations that becomes increasingly worth paying attention to.

Does Fibre “Balance Hormones”?

This is where nutrition language can get carried away. You may see claims that fibre “detoxes excess oestrogen” or “balances female hormones”. That is too simplistic.

Diet, the gut microbiome and hormone metabolism do interact in interesting ways, and some hormones and their metabolites undergo processing involving the liver and gut. But turning that complex biology into “Eat fibre to balance your hormones” goes beyond what we can responsibly conclude.

Fibre has plenty of well-supported benefits. We don't need to invent another one.

Fibre and Oestrogen: What About the “Estrobolome”?

You may also have come across the word estrobolome. It refers broadly to gut microbial genes capable of metabolising oestrogens. It is a genuinely interesting area of research. Researchers are exploring relationships between the microbiome, microbial enzymes and circulating oestrogens.

But this science is still developing. It does not currently give us a clinically established “estrobolome diet” for women. The useful recommendation remains much less glamorous: eat a diverse, fibre-rich diet. Sometimes the most evidence-based advice isn't the trendiest.

Does Fibre Matter for Cholesterol After Menopause?

Cardiovascular risk becomes increasingly important for women through midlife and beyond. Fibre is only one part of cardiovascular nutrition, but certain fibres have established cholesterol-lowering effects.

Oats and barley are particularly useful because they contain beta-glucan, a soluble fibre. Beans, lentils, vegetables, fruit, nuts, seeds and wholegrains can also contribute to a heart-healthy dietary pattern.

Think of fibre as one piece of the cardiovascular puzzle alongside overall diet, movement, strength, sleep, smoking status, blood pressure, blood lipids and metabolic health. Healthy ageing works as a system.

Is All Fibre Equally Good?

No. And this is important. There is a difference between obtaining fibre through whole plant foods and adding isolated fibre to a highly processed product.

The Scientific Advisory Committee on Nutrition specifically notes that extracted or synthetic carbohydrates should only be considered dietary fibre when beneficial physiological effects have been demonstrated (GOV.UK). This doesn't mean added fibres are bad. Some, such as psyllium, have excellent evidence for particular purposes.

But a product containing added fibre is not automatically nutritionally equivalent to lentils, oats, vegetables, berries, wholegrains and nuts. Food brings a package of nutrients with it.

The Best High-Fibre Foods

You do not need unusual ingredients. Some of the best sources are extremely ordinary.

Food	Why it is useful
Beans	Fibre and plant protein
Lentils	Fibre, protein and minerals
Chickpeas	Fibre and plant protein
Oats	Fibre including beta-glucan
Barley	Particularly rich in beta-glucan
Wholegrain bread	Easy everyday fibre
Wholewheat pasta	Simple wholegrain swap
Potatoes with skin	Convenient source
Berries	Fibre and polyphenols
Apples and pears	Easy everyday fruit
Vegetables	Fibre and micronutrients
Nuts	Fibre and unsaturated fats
Seeds	Fibre and healthy fats
Avocado	Fibre and unsaturated fat

The NHS similarly recommends obtaining fibre from a variety of sources including wholegrain cereals, wholemeal bread, brown rice, fruit, vegetables and beans (NHS).

What Does 30 g of Fibre Actually Look Like?

Thirty grams sounds abstract. So imagine a day containing:

• Breakfast: porridge made with oats, berries and a tablespoon of chia or ground flaxseed
• Lunch: wholegrain bread, hummus, salad and an apple
• Dinner: vegetable and lentil curry with brown rice
• Snack: a small handful of nuts

You are suddenly much closer to the target without eating anything particularly unusual. Exact amounts vary with portion size and product, so food labels can be useful if you're curious. But you do not need to count fibre forever. The aim is to learn what a fibre-rich plate looks like.

The Nibu “Add One” Approach

If you're currently eating around the UK average, jumping straight to 30 g may feel difficult. So try something simpler.

• Add one fibre-rich food to breakfast: berries on porridge.
• Add one to lunch: a handful of chickpeas in your salad.
• Add one to dinner: lentils, beans or an extra vegetable.
• Swap one refined grain: white bread for wholegrain.
• Keep the skin on where appropriate, for example, potatoes.

Small additions accumulate remarkably quickly.

Do You Need to Count Grams?

Not necessarily. Tracking can be useful for a few days if you genuinely have no idea how much you're eating. It can help you learn: “Ah, that's what 25–30 g looks like.” But nutrition should not become a daily maths exam.

Once your diet regularly contains wholegrains, pulses, vegetables, fruit, nuts and seeds, you may not need to count at all.

What If Beans Make Me Bloated?

Start small. If you rarely eat pulses, your digestive system may tolerate a few tablespoons better than an enormous bean salad. Increase gradually. Rinsing canned beans and lentils can also make them easier for some people to tolerate.

And remember that individual digestive conditions matter. People with IBS, inflammatory bowel disease or other gastrointestinal problems may require more personalised dietary advice. A high-fibre diet is not automatically appropriate in every medical situation.

Do You Need a Fibre Supplement?

For most people, the first question should be: can I improve my diet? Whole foods provide fibre alongside protein, micronutrients and plant compounds.

However, fibre supplements can be useful in certain situations. Psyllium, for example, has good evidence for constipation and can also influence cholesterol. The 2022 meta-analysis of chronic constipation found fibre supplementation improved treatment response, stool frequency and stool consistency, with particularly useful evidence for psyllium (PubMed).

But a fibre supplement does not turn a low-quality diet into a high-quality one. Think of supplementation as a tool, not a replacement for plants.

Is More Fibre Always Better?

No. This is a good example of why nutrition should not become competitive. If 30 g is good, that doesn't mean 70 g must be better.

Very high fibre intake can cause bloating, gas, abdominal discomfort and changes in bowel habits, especially if increased rapidly. There are also medical situations where fibre intake may need to be adjusted.

The goal is not as much fibre as physically possible. It is enough fibre, from a variety of foods, in a way your digestive system tolerates.

Does Fibre Interfere With Nutrient Absorption?

This concern sometimes appears online. Certain components of plant foods, including phytates, can influence mineral absorption. But this does not mean a normal fibre-rich diet causes nutrient deficiency in healthy people eating a varied diet.

The health evidence overwhelmingly supports eating fibre-rich plant foods. Context matters. A balanced diet containing varied food groups is very different from consuming extreme quantities of isolated fibre.

Fibre and Protein: Women Need Both

Protein has rightly become a major part of the healthy-ageing conversation. We have written extensively about its role in maintaining muscle. If protein is something you're trying to get right, our guide Protein for Women Over 40: How Much Do You Really Need for Healthy Ageing? explains how needs change through midlife and why protein and strength work together.

But one unintended consequence of the protein boom is that some women can end up building diets around protein yoghurt, eggs, chicken, protein shakes, protein bars and cheese, with very few plants. You can hit your protein target while missing fibre completely. Healthy ageing is not a single-nutrient project.

Protein supports muscle. Fibre supports digestive and metabolic health in different ways. You need room for both.

Fibre and Omega-3: Another Reason to Think in Patterns

The same applies to healthy fats. Oily fish can provide EPA and DHA. We explore their role in more detail in Omega-3 for Women: Benefits for Heart, Brain, Skin and Healthy Ageing.

Nuts and seeds provide fibre alongside unsaturated fats and, in some cases, plant omega-3 ALA. Vegetables and wholegrains bring their own nutritional contributions. No single food needs to do everything. And no supplement needs to do everything.

That is exactly how Nibu thinks about healthy ageing. Different systems have different needs.

Myth vs Fact

Myth	Fact
Fibre is mainly for constipation.	Bowel health matters, but fibre-rich diets are also associated with cardiovascular, metabolic and long-term health benefits (PubMed).
Women need a special fibre target after 40.	The UK recommendation for adults is approximately 30 g per day. There isn't a separate standard target for women over 40 (GOV.UK).
Fibre “balances female hormones”.	Gut bacteria and hormone metabolism interact, but claims that fibre simply “balances hormones” overstate the evidence.
Carbohydrates are bad for metabolic health.	Carbohydrate quality matters. Wholegrains, pulses, fruit and vegetables provide fibre and are very different nutritionally from many highly refined carbohydrate foods (PubMed).
If some fibre is good, more is always better.	Very high or rapidly increased intake can cause gastrointestinal symptoms.
You need a fibre supplement.	Most people can obtain fibre through food, although specific fibre supplements can be useful in certain circumstances.

Frequently Asked Questions

Question	Answer
How much fibre should a woman eat each day?	UK guidance recommends an average population intake of approximately 30 g per day for adults aged 16 and over (GOV.UK).
How much fibre do UK adults actually eat?	The latest National Diet and Nutrition Survey reported average intake of 16.4 g per day among adults aged 19–64, and only 4% of adults met the recommendation (GOV.UK).
What are the best sources of fibre?	Wholegrains, beans, lentils, chickpeas, vegetables, fruit, nuts and seeds are excellent sources.
Is fibre good for women over 40?	Yes. Fibre remains an important part of a healthy diet throughout adulthood and is particularly relevant to bowel, cardiovascular and metabolic health.
Does fibre help during menopause?	Fibre is not a menopause treatment, but fibre-rich foods support areas of health that become increasingly important in midlife, including cardiovascular, metabolic and digestive health.
Can fibre lower cholesterol?	Certain soluble fibres, particularly viscous fibres such as beta-glucan and psyllium, can help reduce blood cholesterol.
Does fibre help constipation?	Yes. Fibre can improve constipation in many people, although the type and dose matter. A meta-analysis of randomised trials found improvements in response, stool frequency and consistency (PubMed).
Why am I bloated after increasing fibre?	A sudden increase can lead to greater gas production and digestive discomfort. Increase your intake gradually and drink adequate fluid (NHS).
Are fibre supplements as good as food?	They can have useful specific effects, but they do not provide the full nutritional package found in whole plant foods.
Is 30 g of fibre a minimum?	The UK recommendation is expressed as an average population intake of about 30 g per day, rather than a precise individual minimum every woman must hit daily (GOV.UK). That distinction is worth understanding.

Key Takeaways

• UK adults are advised to consume around 30 g of fibre per day (GOV.UK).
• Most of us fall substantially short. Latest UK survey data put average adult intake at around 16–17 g a day, with only 4% meeting the recommendation (GOV.UK).
• Fibre supports much more than bowel regularity. Higher-fibre diets are associated with better cardiovascular, metabolic and bowel health (PubMed).
• Different fibres perform different jobs. Variety matters.
• Wholegrains, pulses, vegetables, fruit, nuts and seeds are excellent everyday sources.
• Increase fibre gradually if your current intake is low, and drink enough fluid.
• You do not need a separate fibre target simply because you enter perimenopause or turn 40.
• You don't need an exotic superfood. Some of the most valuable foods for healthy ageing are also some of the simplest.

The Nibu Longevity Take

Healthy ageing has a habit of making ordinary things look extraordinary again. Walking. Sleeping. Building muscle. Eating vegetables. Eating enough protein. And, yes, getting enough fibre.

None of these sounds revolutionary. Perhaps that is exactly the point. We live in a wellness culture constantly searching for the next ingredient that will transform our health. Yet some of the strongest foundations have been sitting in our kitchens all along: a bowl of oats, a handful of berries, lentils in a soup, beans in a chilli, vegetables with dinner, nuts with your afternoon tea.

Healthy ageing is not built from one perfect food, one perfect supplement or one perfect morning routine. It is built from hundreds of ordinary choices that become powerful because we repeat them.

At Nibu, supplements have a place in that picture. But they sit alongside the foundations, never instead of them. The goal isn't to eat perfectly. It is to make the everyday things that support your future health easier to do more often.

Conclusion

Fibre may not be the most glamorous subject in nutrition. But perhaps it deserves more attention. The UK recommendation is around 30 g per day, yet the average adult is getting little more than half that amount (GOV.UK).

Closing the gap doesn't require an extreme diet. Start with breakfast. Add some oats or berries. Choose wholegrain bread. Put lentils into a soup. Add beans to dinner. Eat the potato skin. Snack on fruit or nuts. Then build gradually.

Because when it comes to healthy ageing, the small things we do consistently often matter far more than the dramatic things we do occasionally.

References

• Scientific Advisory Committee on Nutrition. Carbohydrates and Health. Public Health England; 2015. Established the UK recommendation for average adult fibre intake of 30 g per day and reviewed evidence relating carbohydrate quality to health. GOV.UK.
• Scientific Advisory Committee on Nutrition. Statement on Expressing Energy, Fat and Carbohydrate Intakes and Recommendations. Office for Health Improvement and Disparities; updated 2025. Confirms an average population fibre intake recommendation of approximately 30 g/day for people aged 16 and over. GOV.UK.
• Office for Health Improvement and Disparities. National Diet and Nutrition Survey 2019 to 2023: Report. Published 2025. Mean adult fibre intake remained below recommendations, with only 4% of adults meeting the target. GOV.UK.
• Reynolds A, Mann J, Cummings J, Winter N, Mete E, Te Morenga L. Carbohydrate quality and human health: a series of systematic reviews and meta-analyses. The Lancet. 2019;393(10170):434–445. doi:10.1016/S0140-6736(18)31809-9. PubMed.
• van der Schoot A, Drysdale C, Whelan K, Dimidi E. The Effect of Fiber Supplementation on Chronic Constipation in Adults: An Updated Systematic Review and Meta-Analysis of Randomized Controlled Trials. American Journal of Clinical Nutrition. 2022;116(4):953–969. doi:10.1093/ajcn/nqac184. PubMed.
• NHS. How to Get More Fibre Into Your Diet. NHS guidance recommends 30 g fibre per day for adults and encourages a variety of plant sources.
• NHS. Good Foods to Help Your Digestion. NHS guidance on fibre, constipation, digestive health and fluid intake.

Continue Reading

• Protein for Women Over 40: How Much Do You Really Need for Healthy Ageing?
• Why Your Metabolism Changes as You Age and What You Can Actually Do About It
• Perimenopause Explained: What Is Happening to Your Body in Your 40s?
• Omega-3 for Women: Benefits for Heart, Brain, Skin and Healthy Ageing
• Healthy Ageing in Your 20s and 30s: 10 Habits Your Future Self Will Thank You For
• Walking for Longevity: How Many Steps Do You Really Need for Healthy Ageing?
• What Is Longevity? A Beginner's Guide to Living Longer and Healthier

About The Nibu Journal

The Nibu Journal is the educational home of Nibu Naturals, a women's healthy-ageing brand built around the philosophy Healthy Ageing, Inside & Out.

Nibu began with Astaxanthin skincare and has since grown to explore the wider foundations of ageing well, from nutrition and strength to women's health, supplements, skin and lifestyle.

We believe women deserve health information that is clear enough to understand, evidence-led enough to trust and optimistic about the privilege of growing older.

Educate first. Build trust. Create desire through understanding. Sell naturally.

Medical Disclaimer

This article is for general educational purposes and is not intended to diagnose, treat or manage a medical condition.

If you have a gastrointestinal condition such as inflammatory bowel disease, significant IBS, bowel narrowing or obstruction, have undergone gastrointestinal surgery, or have been advised to follow a low-fibre diet, speak to your GP, dietitian or another appropriately qualified healthcare professional before substantially changing your fibre intake.

Persistent changes in bowel habits, unexplained bleeding, unexplained weight loss or ongoing abdominal symptoms should be medically assessed.