Key Takeaways
- Most Americans consume only about half the daily fibre their bodies need.
- Fibre supports digestive health, steady blood sugar, and heart health.
- Both soluble and insoluble fibre serve different but equally important roles.
- Whole foods — not supplements — are the most reliable way to increase fibre intake.
- Increasing fibre gradually and drinking more water helps avoid digestive discomfort.
Dietary Fibre
Dietary fibre is a type of carbohydrate found in plant foods that your body cannot fully digest. Unlike other nutrients, it passes relatively intact through your digestive system, playing important roles in gut health, blood sugar regulation, and heart health. It's found naturally in vegetables, fruits, whole grains, beans, and nuts.
Fibre is broadly classified into two types — soluble (which dissolves in water and forms a gel-like substance) and insoluble (which does not dissolve and adds bulk to stool). Most plant foods contain a mix of both.
The Nutrient Most Diets Are Missing
Fibre rarely gets the same attention as protein, vitamins, or healthy fats — but it may be one of the most consistently under-consumed nutrients in the American diet. According to data referenced by the Dietary Guidelines for Americans, most adults eat only about half the fibre recommended daily. That gap has real consequences, not just for digestion but for overall health.
Understanding what fibre actually does — and why it matters — is a practical first step toward a more balanced way of eating. This is general health information to help you make more informed food choices, not a substitute for guidance from your own healthcare provider.
~5%
Americans meeting daily fibre recommendations
Research published in the American Journal of Lifestyle Medicine found that fewer than 1 in 20 Americans meets the recommended daily fibre intake.
25–38g
Recommended daily fibre for adults
The Dietary Guidelines for Americans recommend 25g/day for women and 38g/day for men, with needs adjusting somewhat with age.
15g
Average daily fibre intake in the U.S.
National dietary surveys consistently show average American fibre consumption falls around 15 grams per day — roughly half the recommended amount.
What Fibre Actually Does in Your Body
Because fibre isn't digested the way other carbohydrates are, it takes a different journey through your body — and that journey does a lot of good along the way.
- Gut health: Insoluble fibre adds bulk to stool and helps food move through the digestive tract at a healthy pace, supporting regular bowel movements. Soluble fibre feeds beneficial gut bacteria, which play a growing role in research on immune function and inflammation.
- Blood sugar balance: Soluble fibre slows the absorption of sugar into the bloodstream, which helps moderate blood glucose spikes after meals — a factor relevant to long-term metabolic health.
- Heart health: Certain soluble fibres, like those found in oats and barley, have been associated in research with modest reductions in LDL (low-density lipoprotein) cholesterol levels.
- Satiety: High-fibre foods tend to be more filling, which can support a sense of fullness without requiring larger portion sizes.
These benefits don't come from any single food or supplement — they emerge from consistent, varied fibre intake over time. For more on how individual nutrients interact, see our guide to commonly misunderstood nutrition facts.
A Simple Way to Spot Higher-Fibre Options
When reading a nutrition label, look for foods that provide at least 3 grams of fibre per serving — that's generally considered a 'good source.' Foods with 5 grams or more per serving are considered 'excellent sources.' These labels can be a useful shortcut when comparing packaged options at the grocery store.
Where to Find It: Everyday Fibre-Rich Foods
Fibre is found only in plant foods. The richest sources include:
- Legumes
- Lentils, black beans, chickpeas, and kidney beans are among the most concentrated sources — a single half-cup serving of cooked lentils contains around 8 grams of fibre.
- Whole grains
- Oats, barley, brown rice, quinoa, and whole wheat bread provide fibre that refined grains largely lack. The milling process that creates white flour strips away the fibre-containing bran layer.
- Vegetables
- Broccoli, Brussels sprouts, carrots, and leafy greens all contribute meaningfully. Eating a range of vegetables — rather than relying on one or two — ensures a broader mix of fibre types.
- Fruits
- Pears, apples, raspberries, and bananas are reliably good sources. Eating the skin where appropriate (like on apples or pears) retains more fibre than peeling.
- Nuts and seeds
- Almonds, chia seeds, and flaxseeds offer fibre alongside healthy fats and other nutrients.
Small, consistent swaps — swapping white rice for brown, adding beans to a salad, choosing a piece of fruit over a processed snack — accumulate into meaningful increases over a week. Whole food sources are preferable to supplements; see our overview of when supplements help and when food wins instead.
How to Increase Fibre Without Digestive Discomfort
One of the most common reasons people struggle with a higher-fibre diet is moving too fast. When the digestive system isn't used to processing large amounts of fibre, a sudden increase can cause gas, bloating, or cramping — which understandably puts people off.
A more comfortable approach is gradual: add one or two higher-fibre foods per week rather than overhauling your diet overnight. Equally important is drinking enough water. Fibre — particularly insoluble fibre — works best when it can absorb fluid; without adequate hydration, it can have the opposite of the intended effect. Our article on how hydration and nutrition connect covers this relationship in more detail.
If you have a digestive condition or are managing a chronic health issue, it's worth discussing any significant dietary changes with a qualified healthcare provider before making them. Individual needs and tolerances vary, and personalised guidance is always more reliable than general information.
Fibre Needs May Vary for Some Groups
People with certain digestive conditions — such as irritable bowel syndrome or inflammatory bowel disease — may have specific fibre tolerances that differ from general recommendations. Pregnant individuals and older adults may also have adjusted needs. If you belong to any of these groups, personalised advice from a registered dietitian or physician is especially valuable.
This article is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health or diet.