Fiber: The Underrated Nutrient for Health
Fibre rarely gets the attention that protein or carbohydrates receive, yet it plays a vital role in your health. Many people do not get enough. This guide explains what fibre does, the different types, and simple ways to include more in your diet for lasting benefits.
What fibre is
Fibre is a type of carbohydrate that your body cannot fully digest, which is exactly what makes it valuable. Instead of being broken down for energy like other carbohydrates, it passes through your digestive system, supporting health along the way. Understanding this unique quality explains why fibre is so important despite providing little energy.
Why fibre matters for health
Fibre supports digestive health, helps you feel full and satisfied, and contributes to overall wellbeing. Its role in keeping your digestive system functioning well, and in supporting steady energy and satiety, makes it a nutrient worth prioritising. Getting enough fibre is a simple, powerful habit for long-term health.
Soluble and insoluble fibre
There are two main types of fibre, soluble and insoluble, and both are beneficial. Soluble fibre dissolves in water and supports certain aspects of health, while insoluble fibre adds bulk and supports digestion. A varied diet naturally provides both, so you do not need to track them separately to benefit.
Fibre and fullness
One practical benefit of fibre is that it helps you feel full and satisfied after eating, which can support balanced eating. High-fibre foods tend to be filling and nourishing, making them a valuable part of a healthy diet. This satiety effect is one reason fibre-rich diets are so beneficial.
Good sources of fibre
Fibre is found in whole plant foods: fruits, vegetables, whole grains, legumes, nuts, and seeds. Building your meals around a variety of these foods naturally boosts your fibre intake. Choosing whole, minimally processed options over refined ones is one of the easiest ways to get more fibre every day.
Increasing fibre gradually
If your current intake is low, increasing fibre gradually and drinking enough water helps your body adjust comfortably. Adding too much too quickly can cause temporary discomfort. A steady increase, alongside good hydration, lets you enjoy the benefits of a higher-fibre diet without any downsides.
Making fibre a daily habit
Getting enough fibre is straightforward once it becomes a habit: include fruits and vegetables at meals, choose whole grains, and add legumes, nuts, or seeds. These simple choices ensure you meet your needs consistently. Prioritising fibre-rich whole foods supports your digestion, satiety, and overall health day after day.
How much fibre do adults need?
Official targets differ slightly by country but point in the same direction. UK guidance from the NHS is 30 g of fibre a day for adults, while U.S. recommendations work out to roughly 25 g for women and 38 g for men (about 14 g per 1,000 calories eaten). Surveys in both countries consistently find that most adults fall well short, often landing somewhere in the high teens.
That gap is the practical point: you rarely need a supplement to close it. Swapping refined grains for whole grains, adding a portion of beans or lentils a few times a week, and keeping the skin on fruit and potatoes can add 10–15 g a day without changing what you eat very much.
What 30 g looks like in a normal day
Values vary by brand and portion, but a typical day reaching the target might look like this:
- Breakfast: a bowl of oats (about 4 g) topped with a handful of berries (about 2–3 g) and a spoon of ground flaxseed (about 2 g).
- Lunch: two slices of wholemeal bread (about 5–6 g) with a side salad and an apple eaten with the skin (about 4 g).
- Dinner: half a tin of chickpeas or lentils in a curry or stew (about 6–7 g) with a portion of vegetables (about 3 g).
- Snack: a small handful of almonds (about 3 g).
Checking the “fibre” line on the nutrition label is the quickest way to compare breads and cereals: products listing 6 g or more per 100 g are generally considered high in fibre.
Common side effects and how to avoid them
Bloating and wind are the usual complaints when fibre goes up quickly. They typically settle within a couple of weeks as gut bacteria adapt. Raising intake over two to three weeks rather than overnight, and drinking enough fluid, makes the transition easier because fibre draws water into the gut. People with irritable bowel syndrome, inflammatory bowel disease, or who have had bowel surgery should get individual advice, as the type and amount of fibre that suits them can differ.
Whole foods versus fibre supplements
Supplements such as psyllium can be useful in specific situations, for example for constipation, but they only supply one or two fibre types. The Harvard T.H. Chan School of Public Health notes that fibre-rich whole foods also bring vitamins, minerals, and plant compounds that a powder does not, and that diets high in whole-grain fibre are associated with lower risk of heart disease, type 2 diabetes, and bowel cancer in large population studies.
Nutrition questions
What is fibre?
Fibre is a carbohydrate your body cannot fully digest, which passes through your digestive system and supports health along the way.
Why is fibre important?
Fibre supports digestive health, helps you feel full and satisfied, and contributes to overall wellbeing.
What are good sources of fibre?
Whole plant foods like fruits, vegetables, whole grains, legumes, nuts, and seeds are all good sources of fibre.
How do I increase my fibre intake?
Add more fruits, vegetables, whole grains, and legumes gradually, and drink enough water to help your body adjust comfortably.