Quick answer: the highest-fibre foods per realistic serving are pulses — a cup of cooked split peas or lentils delivers 15 to 16 g, roughly half a day’s target in one bowl. Chia seeds, beans, artichoke, raspberries and green peas follow. Most adults need 25 g a day for women and 38 g for men under 50, and the great majority fall well short. Fruit and vegetables help, but pulses and whole grains are what actually close the gap.
How Much Fibre You Actually Need
Worth fixing the target before listing foods, since most articles skip it entirely.
| Group | Daily target |
|---|---|
| Women under 50 | ~25 g |
| Men under 50 | ~38 g |
| Women 51 and over | ~21 g |
| Men 51 and over | ~30 g |
| General rule | ~14 g per 1,000 calories eaten |
| Children | Roughly 19 to 31 g depending on age and sex |
The fibre gap is the real story here. Average intake in the US and UK sits somewhere around 15 to 18 g a day, and only a small single-digit percentage of adults reach the recommendation. That makes fibre one of the most widely under-consumed nutrients in the diet — which is why the gram figures below matter more than another list of “healthy foods”.
The Top High-Fibre Foods, Ranked by Grams Per Serving
Ranked by what you would realistically eat in one sitting, rather than per 100 g, which flatters seeds and disadvantages vegetables.
| Food | Serving | Fibre | Notes |
|---|---|---|---|
| 1. Split peas | 1 cup cooked | ~16 g | The highest of any common food per serving. Cheap, and works as soup or dal |
| 2. Lentils | 1 cup cooked | ~15.5 g | Also ~18 g protein. No soaking needed, cooks in 20 minutes |
| 3. Black beans | 1 cup cooked | ~15 g | Tinned is nutritionally fine — rinse to cut sodium |
| 4. Chia seeds | 1 oz / 28 g | ~10 g | Very high per gram, but the serving is small. Needs fluid |
| 5. Avocado | 1 whole | ~10 g | Around 5 g for half, which is the more typical serving |
| 6. Green peas | 1 cup cooked | ~9 g | Frozen counts, and is often the cheapest fibre in the shop |
| 7. Raspberries | 1 cup | ~8 g | By far the highest-fibre common fruit |
| 8. Bulgur wheat | 1 cup cooked | ~8 g | Faster than rice and roughly four times the fibre of white rice |
| 9. Artichoke | 1 medium | ~7 g | The highest-fibre vegetable per serving |
| 10. Whole wheat pasta | 1 cup cooked | ~6 g | A straight swap that adds ~4 g over white pasta |
The pattern worth noticing: the top three are all pulses, and they beat every fruit and vegetable on the list by a wide margin. If you are short on fibre, adding beans or lentils to two meals a week closes more of the gap than any amount of extra salad.
Useful runners-up
| Food | Serving | Fibre |
|---|---|---|
| Broccoli | 1 cup cooked | ~5 g |
| Pear, with skin | 1 medium | ~5.5 g |
| Apple, with skin | 1 medium | ~4.5 g |
| Sweet potato, with skin | 1 medium | ~4 g |
| Oats | 1 cup cooked | ~4 g |
| Almonds | 1 oz / ~23 nuts | ~3.5 g |
| Popcorn, air-popped | 3 cups | ~3.5 g |
| Blueberries | 1 cup | ~3.6 g |
| Carrot | 1 medium | ~1.7 g |
Two corrections while we are here, since both circulate widely. Carrots are not a high-fibre food — at around 1.7 g each they are a good source of beta-carotene and a modest source of fibre. And blueberries sit mid-table rather than at the top; raspberries carry more than twice as much.
Soluble and Insoluble: What the Difference Actually Does
Both matter, and most fibre-containing foods provide a mix. The distinction is useful because they solve different problems.
| Soluble | Insoluble | |
|---|---|---|
| What it does | Dissolves in water and forms a gel, slowing digestion | Does not dissolve; adds bulk and speeds transit |
| Main benefits | Lowers LDL cholesterol, blunts post-meal glucose rises, increases fullness | Improves stool bulk and regularity, reduces constipation |
| Best sources | Oats and oat bran, barley, beans and lentils, psyllium, apples, citrus | Wheat bran, whole grains, nuts, and the skins of fruit and vegetables |
| Use it for | Cholesterol and blood glucose | Constipation and regularity |
The cholesterol effect is real but modest, and it comes specifically from viscous soluble fibre — oats, barley, psyllium and beans. Roughly 5 to 10 g a day of that type produces a measurable reduction in LDL. It is a useful contribution rather than a replacement for medication where that has been prescribed.
A third category worth knowing: resistant starch, which behaves like fibre and feeds gut bacteria. It increases when cooked starchy foods are cooled — so cooled potatoes, rice and pasta contain more of it than the same food eaten hot.
How to Add Fibre Without the Bloating
This is where people give up, and it is entirely avoidable.
- Increase gradually — around 5 g a week, not overnight. Going from 15 g to 35 g in a day reliably produces gas, bloating and cramping. Your gut bacteria adapt over weeks, and they will, if you give them time.
- Increase fluid alongside it. This is not optional. Fibre absorbs water, and adding bulk without fluid can make constipation worse rather than better — the single most common reason a high-fibre change backfires.
- Rinse tinned pulses, which reduces both sodium and some of the compounds associated with gas.
- Spread it across the day rather than taking most of it in one meal.
- Keep the skins on fruit, vegetables and potatoes, where a large share of the insoluble fibre sits.
Easy swaps, with the gain
| Swap this | For this | Fibre gained |
|---|---|---|
| White rice | Bulgur or barley | ~+6 g per cup |
| White pasta | Whole wheat pasta | ~+4 g per cup |
| White bread | Wholegrain bread | ~+2 g per slice |
| Half the mince in a chilli or bolognese | Lentils or beans | ~+7 g per portion |
| Crisps | Air-popped popcorn | ~+3 g |
| Juice | The whole fruit | ~+3 to 4 g |
Who Should Be Careful With High-Fibre Diets
More is not universally better, and this section is absent from most fibre articles.
- Crohn’s disease with strictures, or any bowel narrowing. A low-residue diet may be advised instead, since bulk can worsen obstruction risk. Follow your gastroenterology team rather than general advice.
- IBS. Fibre helps some people and worsens others. Many high-fibre foods, particularly pulses, are high in FODMAPs. Soluble fibre such as oats and psyllium is usually better tolerated than wheat bran.
- Gastroparesis, where delayed emptying makes high-fibre foods poorly tolerated.
- Before a colonoscopy or bowel surgery, where a low-fibre preparation is required.
- Anyone with swallowing difficulties, and anyone unable to drink adequate fluids.
- Medication timing. Fibre and fibre supplements can reduce absorption of some medicines, including levothyroxine and certain others. Separate them by a couple of hours and check with a pharmacist.
See a doctor rather than adding fibre if you have blood in your stool, unexplained weight loss, a persistent change in bowel habit lasting more than a few weeks, or ongoing abdominal pain. These need assessment, not dietary self-management.
Supplements Versus Food
Fibre supplements such as psyllium have genuine evidence for constipation and for lowering cholesterol, and they are a reasonable option if you cannot reach your target from food.
What they do not replicate is everything else that arrives with high-fibre food — potassium, magnesium, folate, polyphenols and the varied fibre types that support a diverse gut microbiome. Use supplements to top up, not to substitute. And take them with plenty of fluid, for the reasons above.
For how fibre fits into appetite and weight management specifically, see our guide to fibre and weight loss, and balancing protein, carbs and fats for the wider picture.
Frequently Asked Questions
Per realistic serving, pulses top the list. A cup of cooked split peas provides around 16 g, lentils around 15.5 g and black beans around 15 g — roughly half a day’s target in one bowl. Chia seeds are higher per gram at around 10 g per ounce, but the serving is much smaller. Among vegetables, artichoke leads at around 7 g for a medium one, and among fruit, raspberries at around 8 g per cup.
Around 25 g a day for women and 38 g for men under 50, dropping to roughly 21 g and 30 g after 50 as energy intake falls. A useful general rule is 14 g per 1,000 calories eaten. Most adults fall well short, with average intakes around 15 to 18 g, so fibre is one of the most under-consumed nutrients in the typical diet.
Soluble fibre dissolves in water and forms a gel, which slows digestion — it lowers LDL cholesterol, blunts post-meal glucose rises and increases fullness. Good sources are oats, barley, beans, psyllium, apples and citrus. Insoluble fibre does not dissolve; it adds bulk and speeds transit, which helps regularity and constipation. Good sources are wheat bran, whole grains, nuts and the skins of fruit and vegetables. Most foods contain a mix of both.
Increase gradually, by around 5 g a week rather than all at once, because gut bacteria need weeks to adapt. Increase fluid at the same time — this is the step people skip, and adding bulk without fluid can make constipation worse rather than better. Spread fibre across the day instead of loading one meal, and rinse tinned pulses, which reduces both sodium and some gas-forming compounds.
Not particularly, despite often appearing on high-fibre lists. A medium carrot provides around 1.7 g. Carrots are an excellent source of beta-carotene and a perfectly good vegetable, but they are a modest fibre contributor. A cup of cooked lentils supplies roughly nine times as much.
Yes, particularly if you increase it quickly or without enough fluid, which causes bloating, gas, cramping and sometimes worsened constipation. Very high intakes may also modestly reduce absorption of minerals such as iron and zinc, and fibre can interfere with the absorption of some medicines including levothyroxine, so separate them by a couple of hours. Some people should limit fibre altogether — see the caution list above.
Only as a top-up. Supplements such as psyllium have real evidence for constipation and for lowering cholesterol, and they are reasonable if you cannot reach your target from food. But they do not supply the potassium, magnesium, folate and polyphenols that come with high-fibre foods, nor the variety of fibre types that supports a diverse gut microbiome. Take any supplement with plenty of fluid.
Viscous soluble fibre does, modestly. Around 5 to 10 g a day from oats, barley, psyllium or beans produces a measurable reduction in LDL cholesterol. It is a worthwhile contribution rather than a replacement for prescribed medication, and it works alongside the rest of your diet rather than in isolation.
Sources
- USDA FoodData Central, for the per-serving fibre values.
- Dietary Guidelines for Americans, for daily intake recommendations.
- MedlinePlus — Dietary Fiber.
- NIDDK — Eating, diet and nutrition for constipation.
- NHS — How to get more fibre into your diet.
- American Heart Association — Whole grains, refined grains and dietary fiber.
Last updated: August 2026. Fibre values are approximate and vary with variety, ripeness, preparation and portion size. This article is general information rather than personalised dietary advice. Speak to your doctor or a dietitian before significantly increasing fibre if you have inflammatory bowel disease, a bowel stricture, IBS, gastroparesis or swallowing difficulties, and see a doctor rather than self-managing if you have blood in your stool, unexplained weight loss or a persistent change in bowel habit.
