Fibre: Why It's One of the Most Important Nutrients for Your Health

When we think about healthy eating, protein often takes centre stage. Yet one of the most overlooked nutrients in our diet is fibre.

Current UK Government guidelines recommend consuming 30g of fibre per day as part of a healthy, balanced diet. However, most adults consume significantly less than this, potentially missing out on the many health benefits fibre provides.

Why is fibre so important?

Fibre is the primary fuel source for your gut microbiome—the trillions of bacteria, fungi and other microorganisms that live in your digestive tract. These microbes play a vital role in digestion, immune function, metabolism and overall health.

When beneficial gut bacteria ferment fibre, they produce short-chain fatty acids (SCFAs), which help maintain the gut lining, reduce inflammation and support immune health.

The health benefits of fibre

Increasing your fibre intake can support many aspects of your health, including:

• Better digestion and regular bowel movements

• Improved blood sugar control

• Heart health by helping to lower LDL ("bad") cholesterol

• Weight management by increasing fullness and reducing overeating

• A healthier gut microbiome

• Stronger immune function

• Reduced risk of cardiovascular disease

• Reduced risk of bowel cancer and other chronic diseases

  
  

The two types of fibre

Although we often talk about fibre as one nutrient, there are two main types—and both are important.

Soluble fibre

Soluble fibre dissolves in water to form a gel-like substance in the digestive tract.

It helps to:

• Slow digestion

• Improve blood sugar regulation

• Lower LDL cholesterol

• Keep you feeling fuller for longer

Good sources include:

• Oats

• Barley

• Beans and lentils

• Chickpeas

• Nuts

• Seeds (especially chia and flaxseed)

• Apples

• Pears

• Citrus fruits

Insoluble fibre

Insoluble fibre does not dissolve in water.

Instead, it adds bulk to stools and helps food move efficiently through the digestive system.

It helps:

• Promote regular bowel movements

• Prevent constipation

• Support overall digestive health

Good sources include:

• Wholegrain bread and cereals

• Brown rice

• Wholewheat pasta

• Leafy green vegetables

• Broccoli

• Nuts and seeds

• Fruit and vegetable skins

The healthiest diets contain a variety of both types of fibre from a wide range of plant foods.

What does 30g of fibre actually look like?

Many people assume reaching 30g of fibre is difficult, but it can be achieved through simple food choices across the day.

Breakfast

• 50g porridge oats – 5g

• 1 tablespoon chia seeds – 4g

• 50g raspberries – 3–4g

Total: 12–13g

Lunch

• Lentil and vegetable soup – 7–8g

• 1 slice wholegrain bread – 2–3g

Total: 9–11g

Snack

Choose one:

• 1 apple (with the skin) – 4g

• Carrot sticks with 2 tablespoons hummus – 4–5g

Dinner

• Steamed broccoli – 5g

• Brown rice or quinoa – 3g

Daily total: Approximately 30–32g of fibre

Simple ways to eat more fibre

Small changes can make a big difference.

Try:

• Swapping white bread for wholegrain

• Choosing porridge instead of sugary cereals

• Adding beans or lentils to soups, stews and salads

• Including a handful of berries with breakfast

• Snacking on fruit, nuts or vegetables with hummus

• Leaving the skins on potatoes where appropriate

• Aiming to eat a variety of colourful plant foods each week

Increase fibre gradually

If your current fibre intake is low, increase it slowly over a few weeks and drink plenty of water. A sudden increase may cause bloating or discomfort while your digestive system and gut microbiome adapt.

The takeaway

Fibre does far more than simply keep your digestive system regular. It nourishes your gut microbiome, supports heart and metabolic health, strengthens the immune system and may help reduce the risk of several chronic diseases.

Rather than focusing on one "superfood", aim to include a wide variety of fibre-rich foods every day. Your gut—and the trillions of microbes living within it—will thank you.

Looking to improve your gut health or optimise your nutrition?

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