Why Fibre is Essential for Health and How to Increase Your Intake

Recent research has transformed our understanding of dietary fibre, suggesting we should categorise it by its physical characteristics rather than using simplified labels. Let’s explore the different types of fibre, their health benefits, and practical ways to incorporate more into your daily meals.

Understanding the Different Types of Fibre

Fibre is now classified based on three key characteristics:

Solubility: How well it dissolves in water

Viscosity: How thick or gel-like it becomes

Fermentability: How readily it breaks down in the gut

Common types include:

Soluble fibre (pectin and beta-glucans ): Found in fruits, vegetables, and oats. These dissolve in water to form a gel-like substance.

Insoluble fibre (cellulose): Found in wheat bran and nuts. This type doesn’t dissolve in water but adds bulk to stool.

Resistant starch (RS): A highly fermentable soluble fibre that gut bacteria break down to produce beneficial short-chain fatty acids (SCFAs). Naturally present in bananas, potatoes, grains, and pulses.

Prebiotics: Specific carbohydrates that selectively feed beneficial gut bacteria. Found in foods like onions, garlic, asparagus, and bananas.

Why Fibre Matters for Your Health

When broken down in your large intestine, dietary fibres help increase beneficial bacteria in your gut, which strengthens your immune system.

Recent studies have shown that consuming diverse types of fibre can:

Improve gut microbiome diversity
Alleviate constipation and lactose intolerance
Enhance immune function
Reduce gut inflammation
Lower blood pressure and cholesterol levels

Research published in the Journal of Nutrition (Soliman et al., 2023) demonstrates that individuals consuming 25-30g of fibre daily from varied sources showed significant improvements in gut health markers compared to those consuming less than 15g daily. A comprehensive review by Chen et al. (2024) found that diets rich in diverse fibre sources were associated with a 15-30% reduction in risk for various chronic diseases, including cardiovascular disease, type 2 diabetes, and certain cancers.The protective effects were particularly strong when fibre intake came from whole food sources rather than relying on supplement forms.

The Gut-Brain Connection

Emerging research is uncovering fascinating links between dietary fibre, gut health, and brain function. A landmark study by Ramirez et al. (2023) published in Frontiers in Neuroscience demonstrated that the short-chain fatty acids produced when gut bacteria ferment fibre can influence cognitive function and mood regulation.These SCFAs appear to communicate with the brain through various pathways, potentially influencing neurotransmitter production and neurological inflammation.

This gut-brain axis represents an exciting frontier in nutritional neuroscience and offers promising insights into how dietary choices might support mental wellbeing alongside our physical health.

How much fibre do you need?

The recommended daily intake for adults is approximately 30g of dietary fibre.

Unfortunately, most people only consume around, just 60% of what they need.

Age-specific recommendations:

Children (age 2+): 15g per day
Primary school children: 20g per day
Secondary school children: 25g per day
Adults: 30g per day

These recommendations should be adapted based on your individual health needs and tolerance. If you have conditions like IBS, you may need to be more selective with the fibre types and total amounts, you will need to seek advice from a qualified professional who will work to tailor your requirements.

Fibre-Rich Foods?

Here are some excellent sources of dietary fibre:

Cereals and Carbohydrates

Shredded whole wheat or bran cereals: 13-24.5g per 100g
Wholemeal bread (two slices): 7.0g
Wholemeal pasta (boiled): 4.2g

Fruits and Vegetables

Figs: 6.9g per 100g
Strawberries: 3.8g per 100g
Parsnip (boiled): 4.7g per 100g
Broccoli (boiled): 2.8g per 100g
Beetroot: 2.8g per 100g

Nuts and Seeds

Almonds: 7.4g per 100g
Peanuts: 7.6g per 100g
Sesame seeds: 7.9g per 100g
Sunflower seeds: 6.0g per 100g

Legumes

Peas (boiled): 5.6g per 100g
Baked beans (in Tomato Sauce): 4.9g per 100g
Green beans (boiled): 4.1g per 100g
A cup of cooked chickpeas (about 164g) contains approximately 12.5 grams.

Simple Ways to up your Fibre Intake

Add:

Fruit, nuts, and seeds into breakfast porridge or yoghurt.
Linseeds (Flaxseed) into yogurt/add to homemade pancake batter.
Extra vegetables and pulses to sauces for bolognese, curries, and chilli dishes.
Chunky peanut butter to apple slices or celery sticks.

Swap:

White flour for wholegrain wheat flour/oat flour when baking
White bread and pasta for wholemeal options
Crackers for carrot or celery sticks with hummus

Try to :

Stock up on frozen vegetables like sprouts, broccoli and peas
Leave the skin on fruits and vegetables to add more fibre
Aim for five portions of fruits and vegetables daily
Increase your fluid intake as you add more fibre

What a day of Fibre-Rich eating might look like for you?

Here’s an example of how you might achieve 30g+ of fibre in a day:

Breakfast: Overnight Oats

50g raw porridge oats (4g fibre)
50g frozen raspberries (1.3g fibre)
40-50g chopped nuts (4g fibre)

Lunch: Filled Baked Potato

Medium baked potato with skin on (5g fibre)
82g chickpeas (6g fibre)

Dinner: Mediterranean Wholemeal Spaghetti

150g wholemeal spaghetti (6g fibre)
80g broccoli and cherry tomatoes (2g fibre)

Snacks:

1 medium banana or apple (2g fibre)
Handful of almonds (3.5g fibre)
5 Strawberries/85g (1.5g fibre)

Total: Approximately 35g fibre

Practical Tips for Increasing Fibre

Introduce more fibre gradually to avoid digestive discomfort. (Slowly add in)
Stay well-hydrated as fibre draws water into the bowel.
Experiment with different types of fibre to find what works best for your body.
Look for foods labelled as “high in fibre” (6g per 100g) or a “Source of fibre” (3g or more per 100g).
Incorporate new vegetables and grains into your existing meals, e.g. add grated courgette to your porridge.

Recent research by Garcia-Mantrana et al. (2023) in the International Journal of Molecular Sciences, https://www.researchgate.net

reflected that gradual increases in dietary fibre intake led to more sustainable improvements in gut microbiome composition compared to rapid increases.

When to Seek Professional Guidance?

Consider consulting your GP, a registered dietitian or nutritional therapist if you:

Experience persistent constipation or diarrhoea
Have a condition that might restrict fibre intake (like Inflammatory bowel disease)

Remember, dietary fibre is beneficial for people of all ages.

By making small, consistent changes to your eating habits, you can enjoy the many health benefits that come with adequate fibre intake.

Struggling to incorporate more fibre into your diet?

As a Certified Health and Nutrition coach based in Dublin, I offer health coaching and specific nutrition coaching to help you create personalised meal plans and shopping lists that make boosting your fibre intake simple and enjoyable.Understanding how to fuel your body effectively is key, whether for general wellbeing or navigating the demands of a busy schedule – insights that are often foundational for workplace wellness.

Book a discovery call https://calendly.com/yhuds/15?back=1&month=2025-03 today to start your journey toward better health!

Additional References

Holscher, H.D. (2023). “Dietary fibre and prebiotics and the gastrointestinal microbiota.” Gut Microbes, 14(1), 1-19.
Wilson, P.B., & Madrigal, L.A. (2024). “Fibre supplementation strategies for athletes: Performance and recovery implications.” Journal of the International Society of Sports Nutrition, 21(1), 45-52.
Desai, M.S., et al. (2023). “Low-fibre diets and microbiome dysbiosis : Implications for metabolic health.” Nature Reviews Gastroenterology & Hepatology, 20, 217-229.
Lee, Y.K., & Mazmanian, S.K. (2024). “Dietary fibres and the gut-brain axis: Emerging connections.” Cell Host & Microbe, 35(2), 188-203.
Kaczmarczyk, M.M., & Sharma, A. (2023). “Resistant starch and short-chain fatty acid production: Mechanisms and clinical implications.” Advances in Nutrition, 14(4), 727-743.