High Fiber Foods: Full Chart and How Much Fiber You Need Per Day

High fiber foods are legumes, whole grains, nuts and seeds, fruit eaten with the skin on, and vegetables. With one plate of cooked lentils (14.2 g), two slices of wholemeal bread (3.6 g) and one unpeeled pear (4.7 g) you are already at 22.5 g of the 25 g a day EFSA sets. Here is how much fiber each food has, with the database identifier next to it, and what the evidence says about each benefit claimed for it.

What is dietary fiber?

Dietary fiber is the part of plant foods your small intestine neither digests nor absorbs: it reaches the colon almost intact, where part of it ferments and part of it adds bulk. The name covers compounds that behave very differently from one another. EFSA sets 25 g a day. (EU legal texts spell it fibre, the British form; this guide uses the US spelling fiber except inside quoted claim wordings, which are reproduced verbatim.)

• Soluble fiber: dissolves in water and forms viscous gels that slow gastric emptying and absorption.
• Insoluble fiber: does not dissolve, adds bulk to stools and speeds up passage through the gut.
• Resistant starch: starch that escapes digestion in the small intestine and arrives in the colon as a fermentable substrate.

Soluble fiber

Soluble fiber dissolves in water and forms a gel. That gel slows the passage of nutrients through the small intestine and it is the basis of the effects the European Union treats as proven on cholesterol and on post-meal blood glucose. It is found in oats and barley (beta-glucans), in fruit (pectins), in legumes and in psyllium. Not everything inside the group behaves the same: psyllium is soluble but resists fermentation, which is why it softens stools without generating as much gas as inulin or fructo-oligosaccharides. The most viscous ones (pectins, beta-glucans, guar gum) concentrate the measured effects on cholesterol, post-meal blood glucose and satiety.

Insoluble fiber

Insoluble fiber neither dissolves nor forms a gel: it passes through the digestive tract adding mass. It is the fiber of the wheat bran cuticle, fruit skin, leafy vegetables and whole grains. For it the European Union authorizes two very specific claims: "Wheat bran fibre contributes to an acceleration of intestinal transit" and "Wheat bran fibre contributes to an increase in faecal bulk" (Regulation (EU) 432/2012). Both require the food to qualify as HIGH FIBRE, meaning at least 6 g of fiber per 100 g or 3 g per 100 kcal (Regulation (EC) 1924/2006), and the first one also requires telling the consumer that the effect is obtained with 10 g a day of wheat bran fiber. The same HIGH FIBRE requirement applies to the equivalent claims for oat, barley and rye fiber.

Resistant starch

Resistant starch is starch that is not digested in the small intestine and behaves like a fermentable fiber. It appears in legumes and in underripe banana, and it has its own authorized claim: "Replacing digestible starches with resistant starch in a meal contributes to a reduction in the blood glucose rise after that meal", on condition that resistant starch makes up at least 14% of total starch (Regulation (EU) 432/2012).

High fiber foods: the full chart

The high fiber foods that concentrate the most per 100 g are wheat bran (42.8 g), chia (34.4 g) and flaxseed (27.3 g). But per real serving legumes win: a 180 g plate of cooked lentils gives 14.2 g. The chart ranks 36 foods with fiber by content.

• Legumes: the best fiber-to-serving ratio, because you eat them by the plate and not by the spoonful.
• Nuts and seeds: very high density per 100 g, but the usual serving is 15 to 30 g.
• Whole grains: the change with the most cumulative impact, because it repeats at every meal.
• Fruit with the skin on: a whole pear gives 4.7 g per piece and part of that fiber is in the skin.
• Vegetables: bulk and satiety for few calories; the artichoke is the queen, with 11.4 g per 200 g serving.

The values per 100 g are traceable to a database: every row carries its identifier from USDA SR Legacy (version 2018-04) or Foundation Foods (version 2025-04-24), consulted on 2026-08-14. The grams per serving are not a database figure: they are a convention of standard Spanish dietetic practice (legume plate 180 g cooked, pasta and rice 150 to 200 g cooked, fruit one piece, nuts 30 g). The colour code uses the labelling thresholds of Regulation (EC) 1924/2006: High from 6 g/100 g or 3 g/100 kcal and Source from 3 g/100 g or 1.5 g/100 kcal; Low is our own label for whatever falls below, not a category of the Regulation.

How to read the chart. Where there is no measurement it says "n/a", not an invented number. Total fiber comes from the AOAC enzymatic-gravimetric method and the soluble/insoluble split from AOAC 991.42, 991.43 and 993.19: these are different methods and each value is rounded separately, so soluble plus insoluble does not always add up to the total (you can see it in strawberries, 0.7 + 0.9 against 1.8).

Why the "soluble" column is nearly empty. The Spanish Food Composition Database (BEDCA) does not publish the soluble/insoluble split for any food, and USDA measures it only in Foundation Foods and only for a handful. Any chart that publishes soluble and insoluble fiber for 25 foods while citing BEDCA is copying without a source. One more warning: raw and cooked are not interconvertible by simple proportion, and mixing databases with different analytical methods introduces a systematic error, not a random one. That is why this chart uses USDA consistently.

Legumes

Legumes are the food with the most fiber per plate in the Spanish diet and they supply only 9.2% of the fiber actually eaten there (ANIBES, total sample). A 180 g plate of cooked lentils gives 14.2 g of fiber; chickpeas, 13.7 g; white beans, 11.3 g. One plate a day covers more than half the EFSA figure.

Nuts and seeds

Nuts concentrate a lot of fiber per 100 g and little per serving, because the real serving is 30 g. Almonds give 12.5 g/100 g (3.8 g per handful), pistachios 10.6 g (3.2 g) and walnuts 6.7 g (2.0 g). Seeds play in another league per 100 g: chia 34.4 g and flaxseed 27.3 g, but at 15 g per tablespoon they land at 5.2 and 4.1 g respectively. If you want the detail on each one, we have a complete guide to nuts and another one specifically on peanut properties and benefits.

Whole grains

Grains and flours are already the leading source of fiber in Spain (39.1% of the total, ANIBES, total sample), so swapping white for wholemeal pays off at every meal: wholemeal bread has 6.0 g/100 g against 2.7 g for white, and cooked wholemeal pasta 3.9 g against 1.8 g. A plate of pasta goes from 3.6 to 7.8 g of fiber just by changing the packet, and two slices of wholemeal bread add 3.6 g.

In oats, part of that fiber is beta-glucans, the fiber with the most authorized health claims in the European Union: cholesterol, post-meal blood glucose and faecal bulk, plus the two disease risk reduction claims of Regulations (EU) 1160/2011 and 1048/2012 for oat and barley beta-glucan. Whole grain also has data of its own: for every extra 15 g of whole grain a day, the meta-analysis in The Lancet observed a relative risk of 0.94 for all-cause mortality (95% CI 0.92 to 0.95) and 0.93 for coronary heart disease (0.89 to 0.98), with reductions of 13% to 33% comparing high with low intake (Reynolds et al., 2019).

Fruit

Fruit supplies 16.6% of the fiber eaten in Spain (ANIBES, total sample) and its figure depends on one gesture: peeling it or not. Pear has 3.1 g/100 g, of which 2.8 g are insoluble (USDA Foundation 746773), and part of that fiber is in the skin. Per piece, pear gives 4.7 g, apple with skin 3.6 g, navel orange 3.6 g, banana 3.1 g and kiwifruit 3.0 g. Dried fruit multiplies the figure: dried figs 9.8 g/100 g and prunes 7.1 g.

Vegetables

Vegetables supply 24.1% of the fiber eaten in Spain (ANIBES, total sample) and their advantage is the serving: 200 g of cooked artichoke give 11.4 g of fiber and 200 g of broccoli, 6.6 g. In cooked broccoli that fiber is practically all insoluble: the soluble fraction falls below 0.1 g/100 g in two independent Foundation Foods samples (321796 and 321752), with total fiber between 2.2 and 3.2 g against the 3.3 g in SR Legacy. Cooked spinach gives 4.8 g per 200 g serving and raw carrot 2.8 g per 100 g.

How much fiber you need per day

EFSA sets an adequate intake of 25 g of fiber a day for adults, with no distinction between men and women; the WHO recommends at least 25 g a day of naturally occurring fiber. In Spain, adults eat 15.8 g a day among those who report their diet plausibly: a 37% shortfall.

• EFSA: 25 g/day in adults, the same figure for both sexes (EFSA, Dietary Reference Values, Summary report, 2017). In children and adolescents, 10 g/day from 1 to 3 years, 14 g from 4 to 6, 16 g from 7 to 10, 19 g from 11 to 14 and 21 g from 15 to 17.
• WHO 2023: at least 25 g/day in adults (strong recommendation) and, conditionally, 15 g from 2 to 5 years, 21 g from 6 to 9 and 25 g from 10 upwards.
• Energy-based criterion: 14 g per 1,000 kcal, equivalent to 25 g in women and 38 g in men, is the reference used in the United States (Dahl and Stewart, 2015, J Acad Nutr Diet).
• What Spain actually eats: 15.8 g/day in plausible reporters and 12.5 g/day in the total sample (ANIBES, Nutrients 2017).

Watch what those 25 g are. EFSA publishes them as an adequate intake, not as a recommended daily amount derived from an average requirement: it is the threshold below which the panel does not consider normal bowel function assured. A floor, not an optimum. The Reynolds meta-analysis places the best behaviour between 25 and 29 g/day and adds that above 30 g/day there are additional benefits.

We also know where the Spanish shortfall comes from and at what time of day. The fiber eaten there comes from grains and flours (39.1%), vegetables (24.1%), fruit (16.6%) and legumes (9.2%), and it concentrates in the main meal (47.4%) and dinner (28.3%); these are percentages of the total sample of the ANIBES study. Breakfast stops at 13.0% and the afternoon snack at 5.9%.

Benefits of fiber according to the evidence

The evidence on fiber is strong in epidemiology and modest in trials. Every extra 8 g of fiber a day was associated with 7% lower all-cause mortality and 19% lower coronary heart disease; in randomized trials the effect on weight is small (Reynolds et al., 2019). Below, each benefit on its own, starting with the best measured. The last one, gut bacteria, is the one that holds up worst once you read the trials.

Mortality and disease

The reference is the series of systematic reviews and meta-analyses published in The Lancet by Reynolds and colleagues in 2019: 185 prospective studies, almost 135 million person-years and 58 clinical trials with 4,635 adults. For every extra 8 g of fiber a day, intake was associated with a relative risk of 0.93 for all-cause mortality (95% CI 0.90 to 0.95), 0.81 for coronary heart disease incidence (0.73 to 0.90), 0.85 for type 2 diabetes (0.82 to 0.89) and 0.92 for colorectal cancer (0.89 to 0.95). These are observational associations, not a causal relationship demonstrated in each individual.

The authors themselves also stress that this literature refers to high fiber foods, not to synthetic or extracted fiber: extrapolating these results to a supplement is not supported by the meta-analysis.

Cholesterol

Oat and barley beta-glucans are the only fiber with an effect on cholesterol recognized by the European Union in the disease risk reduction category. A meta-analysis of 28 controlled trials found that with at least 3 g/day of oat beta-glucan, LDL fell by 0.25 mmol/L (95% CI 0.20 to 0.30; p < 0.0001), about 9.7 mg/dL, and total cholesterol by 0.30 mmol/L (0.24 to 0.35), about 11.6 mg/dL, with no significant effect on HDL or triglycerides (Whitehead et al., 2014, Am J Clin Nutr). Doses ranged from 3.0 to 12.4 g/day over 2 to 12 weeks, and the reduction was larger the higher the baseline LDL. Worth knowing: the meta-analysis included internal reports from a company in the beta-glucan business. With total fiber the effect is far more modest: across 36 trials, total cholesterol fell by 0.15 mmol/L (Reynolds et al., 2019).

The wording the European Union allows is "Beta-glucans contribute to the maintenance of normal blood cholesterol levels", with at least 1 g of beta-glucans from oats, oat bran, barley or barley bran per quantified portion and informing the consumer that the effect is obtained with 3 g/day (Regulation (EU) 432/2012). The two coronary heart disease risk reduction claims, with the same dose conditions, are in Regulations (EU) 1160/2011 (oats) and 1048/2012 (barley).

Blood glucose

Fiber lowers blood glucose in people with diabetes or prediabetes, not in healthy populations. In a meta-analysis of 42 trials with 1,789 adults with diabetes or prediabetes, increasing fiber reduced HbA1c by 2.00 mmol/mol (95% CI −3.30 to −0.71) and fasting plasma glucose by 0.56 mmol/L (−0.73 to −0.38) (Reynolds et al., 2020, PLoS Medicine). Going from 19 g/day to 35 g/day was associated with 14 fewer deaths (95% CI 4 to 19) per 1,000 participants over follow-up, and the authors propose increasing by 15 g/day or reaching 35 g/day in that population.

In high versus low fiber trials outside the diabetic population, by contrast, there was no significant effect on HbA1c: 6 trials, SMD −0.35 (95% CI −0.73 to 0.03), with low quality of evidence (Reynolds et al., 2019). What is recognized in the EU is the acute effect of viscous fibers within a meal: "Consumption of beta-glucans from oats or barley as part of a meal contributes to the reduction of the blood glucose rise after that meal", with at least 4 g of beta-glucans for each 30 g of available carbohydrates in the portion. Equivalent claims exist for wheat endosperm arabinoxylan, pectins, hydroxypropyl methylcellulose and resistant starch (Regulation (EU) 432/2012).

If you take medication for diabetes, a large change in fiber intake can alter your glycaemic response: discuss it with your doctor first.

Satiety and weight

Viscous fiber reduces body weight by 0.33 kg on average. The figure comes from a meta-analysis of 62 trials with 3,877 people on free diets: 0.33 kg (95% CI −0.51 to −0.14; p = 0.004), 0.63 cm of waist circumference and 0.28 kg/m² of BMI, with no significant effect on body fat percentage (Jovanovski et al., 2020, Am J Clin Nutr). In the Reynolds 2019 trials the figure was similar, 0.37 kg. Earlier, a systematic review had already seen that the most viscous fibers (pectins, beta-glucans, guar gum) reduced appetite in 59% of comparisons against 14% for the less viscous ones, although its authors concluded that the effects on intake and weight were small and without a clear dose-response relationship (Wanders et al., 2011, Obesity Reviews). Any product sold as a slimming aid because it contains fiber is overselling an effect of 330 grams.

Intestinal transit

Fiber increases stool frequency in chronic constipation. In a meta-analysis of 16 randomized trials with 1,251 people with chronic constipation, fiber improved frequency (SMD 0.72; 95% CI 0.36 to 1.08), consistency (SMD 0.32) and straining (SMD −0.32), with 66% responders against 41% in the control group (van der Schoot et al., 2022, Am J Clin Nutr).

Psyllium was the fiber with the largest effect size: SMD 1.13 on frequency, equivalent to +3.08 bowel movements per week (95% CI 0.61 to 5.54), plus improvements in consistency (SMD 0.52) and straining (SMD −0.65). Galacto-oligosaccharides added 0.71 bowel movements per week. Inulin improved consistency but not frequency, and polydextrose showed no effect. Dose and duration matter: it took more than 10 g/day and at least 4 weeks, and only from those 4 weeks onwards did total transit time improve significantly (−18.4 hours; 95% CI −31.5 to −5.4).

Gut bacteria: what the evidence actually says

Fiber does not increase gut bacterial diversity. The best meta-analysis available pools 64 randomized trials with 2,099 healthy adults and found that fiber increases Bifidobacterium (SMD 0.64; 95% CI 0.42 to 0.86) and Lactobacillus (SMD 0.22; 0.03 to 0.41), but found no difference at all in alpha diversity (So et al., 2018, Am J Clin Nutr). The industry's most repeated statement, that fiber increases the diversity of your gut bacteria, is precisely the one that analysis does not support.

Something similar happens with butyrate: SMD 0.24 with p = 0.05 and an interval that touches zero (0.00 to 0.47), with no effect on acetate or propionate. And what is measured is faecal butyrate, a poor indicator of actual production, because a good part of it is absorbed in the colon. By subgroup, only fructans (inulin and FOS) and galacto-oligosaccharides increased both bacterial genera.

Fiber is not a synonym for prebiotic: the international consensus defines the latter as "a substrate that is selectively utilized by host microorganisms conferring a health benefit", and requires that benefit to be documented (Gibson et al., 2017). And changing the count of one bacterium is a surrogate marker, not a clinical outcome: Regulation (EU) 432/2012 contains no authorized health claim on gut bacteria for fiber.

Which fiber to choose for your goal

There is no single best fiber: it depends on the goal. For transit, the most effective in trials is psyllium, at more than 10 g a day for at least 4 weeks; for cholesterol, oat or barley beta-glucans at 3 g a day; for post-meal glucose, viscous fibers within the meal; and if what you want is less gas, poorly fermentable fiber increased little by little. The chart crosses goal, fiber, where to find it and the dose with evidence behind it.

Fiber supplements: psyllium, glucomannan and inulin

Psyllium, glucomannan and inulin are the three most searched isolated fibers and the three work differently: one hydrates and adds bulk, another forms a very viscous gel and the third ferments. JustLoading sells none of the three, so what follows is editorial information, not a purchase recommendation.

• Psyllium: husk of Plantago ovata; holds water, resists fermentation and is the fiber with the most support for regularity.
• Glucomannan: konjac fiber, extremely viscous; it is the only fiber with an authorized body weight claim in the EU.
• Inulin and FOS: highly fermentable fructans; they improve stool consistency but not frequency, and they produce the most gas.
• GOS and polydextrose: galacto-oligosaccharides added 0.71 bowel movements per week in the constipation meta-analysis; polydextrose showed no effect in that same analysis.

On glucomannan you have to be very precise, because it is the only fiber with an authorized weight loss claim in the whole European Union and it comes with three cumulative conditions. The literal wording is "Glucomannan in the context of an energy restricted diet contributes to weight loss", and it may only be used if the food provides 1 g of glucomannan per quantified portion, if the consumer is told the effect is obtained with 3 g/day in three doses of 1 g with one or two glasses of water before meals, and in the context of an energy restricted diet. It also requires a choking hazard warning, which is mandatory for pectins and hydroxypropyl methylcellulose too. Any other fiber sold "for weight loss" is outside the law.

One general warning applies to all three: the WHO specifies that its 25 g recommendation refers to fiber naturally occurring in foods as consumed, and the authors of the Lancet meta-analysis warn that their evidence comes from high fiber foods, not from extracted or synthetic fiber. A tub of fiber does not inherit the data of a plate of lentils.

How to reach 30 g of fiber a day

Reaching 30 g of fiber a day does not need supplements: it needs legumes, whole grain cereal, fruit with the skin on and nuts placed in the meals you already eat. This one-day menu adds up to 40.7 g with normal servings, and the running total is shown so you can see where each gram is won.

Look at the distribution: the plate of lentils alone does 35% of the total and the white rice at dinner contributes 0.6 g. Drop the afternoon snack and the oats and you are still at 31.8 g. The minimum version (one plate of legumes, 14.2 g; wholemeal bread at lunch, 3.6 g; one pear with skin, 4.7 g, and a handful of almonds, 3.8 g) already puts you at 26.3 g, above EFSA's adequate intake. Five changes, in order of payoff:

1. One plate of legumes a day: 14.2 g with lentils, 13.7 g with chickpeas. That is 56% of the recommendation in a single meal.
2. Switch bread and pasta to wholemeal: bread goes from 1.6 to 3.6 g per 60 g and pasta from 3.6 to 7.8 g per plate.
3. Eat fruit with the skin on: pear has 2.8 g of insoluble fiber per 100 g, and part of that fiber is in the skin.
4. A 30 g handful of nuts: 3.8 g with almonds, 3.2 g with pistachios.
5. Attack breakfast: in Spain it supplies only 13.0% of the day's fiber. 40 g of oats and a piece of fruit take it to 7.2 g in one go.

If your gap is between meals, a bar with declared fiber is a convenience option. The JustLoading catalogue has 18 references with fiber declared per unit, between 1.2 and 9.1 g, mostly in bar format, and also bar packs. The 10-bar pack with vegetable fibre (oligofructose and inulin) adds up to 41.5 g of fiber across all of them, according to their published nutrition tables. No bar replaces high fiber foods: the Reynolds 2019 evidence comes from foods, not from added fiber.

Fiber and sport

There are no official fiber intake recommendations in sports nutrition guidelines: it is a gap acknowledged in the scientific literature. What is documented is that from roughly 2 hours of exercise at 60% of VO₂max, significant digestive disturbances appear, regardless of fitness level.

• Quantified threshold: 2 hours at 60% of VO₂max is where relevant gastrointestinal perturbations show up, and heat stress and running make them worse than other exercise modes (Costa et al., 2017).
• What gets disrupted: intestinal injury, permeability, endotoxaemia, slower gastric emptying, slowed transit and malabsorption.
• What is missing: no sports nutrition guideline sets how much fiber to take or when (Ozduran and Gezmen-Karadag, 2026, IJSNEM).
• Risk of excess: digestive discomfort and, in athletes with high energy demands, a lower calorie intake than needed.

Any figure along the lines of "cut fiber 24 hours before competing" does not come today from a consensus document of the sports nutrition societies. The most recent review on fiber in sport, published in the International Journal of Sport Nutrition and Exercise Metabolism in 2026, confirms that gap and adds that many athletes do not even reach general population targets, often because of pre-competition restrictions or fear of digestive discomfort.

That same review, narrative rather than a meta-analysis, proposes periodizing fiber according to the training calendar, selecting sources and adapting gradually, and describes excess fiber as a cause of digestive discomfort and of insufficient calorie intake in athletes with high demands. Fiber is worked on during normal training days, not on the morning of the race.

Side effects and who should be careful

Increasing fiber has a cost. In controlled trials it significantly increases flatulence and improves neither bloating nor abdominal pain. There is no official upper limit for dietary fiber, but tolerance varies by type of fiber and by person, and there are situations where it is worth asking first.

• Flatulence: fiber increases it significantly, SMD 0.80 (95% CI 0.47 to 1.13; p < 0.00001), while bloating and abdominal pain did not improve in the same meta-analysis.
• No upper limit: neither EFSA nor the dietary reference intake system used in the United States sets a tolerable upper intake level.
• Water: the advice to take fiber with plenty of liquid is a safety measure and it appears in the European regulations themselves, because of the choking hazard with glucomannan, pectins and hydroxypropyl methylcellulose.
• Gradual increase: it is standard clinical practice and one of the strategies proposed in the sports literature, although no trials compare a gradual against an abrupt increase.

Irritable bowel syndrome. Here fiber is not the automatic answer. In a network meta-analysis of 51 trials with 4,644 patients, soluble fiber came out neither better nor worse than the other options: there were no significant differences between active treatments in direct or indirect comparisons, and only 13 of the 51 trials were at low risk of bias (Black et al., 2020, Lancet Gastroenterol Hepatol). The low FODMAP diet is restrictive, temporary and should be supervised by a registered dietitian.

A specific warning about bars. Several bars on the market, including some in the JustLoading catalogue, declare 6.6 g of polyols per unit on the label with the notice that excessive consumption may produce laxative effects. That effect does not come from the fiber, it comes from maltitol-type polyols. If you eat two or three bars in a row and feel discomfort, the suspect is not the fiber content.

When to ask before increasing fiber: if you have inflammatory bowel disease (Crohn's, ulcerative colitis), especially during a flare; if you have an intestinal stricture, a history of subocclusion or recent digestive surgery; if you have irritable bowel syndrome; if you have swallowing problems; if you are on drug treatment for diabetes; and whenever constipation comes with alarm signs such as blood, weight loss, an abrupt change in bowel habit or onset after the age of 50. That last one is not treated with fiber: it is investigated.

Frequently asked questions about fiber

Ten of the questions Google shows under "People also ask" for fiber.

What foods are high in fiber?

Legumes, nuts and seeds, whole grains, fruit eaten with the skin on, and vegetables. Among foods with fiber, wheat bran leads per 100 g (42.8 g), followed by chia seeds (34.4 g) and flaxseed (27.3 g); per real serving legumes win, with 14.2 g in a 180 g plate of cooked lentils (USDA SR Legacy 172421).

How much fiber do you need per day?

EFSA sets an adequate intake of 25 g of fiber a day for adults, with no difference between men and women, and the WHO recommends at least 25 g a day of naturally occurring dietary fiber. The energy-based criterion used in the United States is 14 g per 1,000 kcal, which works out at about 25 g for women and 38 g for men (Dahl and Stewart, 2015, J Acad Nutr Diet). For children and adolescents EFSA sets 10 g a day from 1 to 3 years, 14 g from 4 to 6, 16 g from 7 to 10, 19 g from 11 to 14 and 21 g from 15 to 17.

What is the best fiber for constipation?

Psyllium (Plantago ovata) is the fiber with the strongest support. In a meta-analysis of 16 randomized trials in 1,251 people with chronic constipation, psyllium increased stool frequency by 3.08 bowel movements per week (95% CI 0.61 to 5.54) and had the largest effect size of any fiber, also improving consistency and straining (van der Schoot et al., 2022, American Journal of Clinical Nutrition). The effect needs more than 10 g a day for at least 4 weeks. JustLoading does not sell psyllium. If constipation is persistent or comes with alarm signs, talk to a healthcare professional before changing your fiber intake.

What is the highest fiber food?

Wheat bran, with 42.8 g of fiber per 100 g (USDA SR Legacy 169722). Chia seeds (34.4 g) and flaxseed (27.3 g) come next. That said, nobody eats 100 g of bran: per real serving legumes win, because a 180 g plate of cooked lentils gives about 14.2 g of fiber against the 6.4 g in a heaped 15 g tablespoon of bran.

What are the top 10 high fiber foods?

By grams of fiber per 100 g, the first ten in the chart in this article are: wheat bran (42.8), chia seeds (34.4), flaxseed (27.3), air-popped popcorn (14.5), almonds (12.5), dark chocolate 70 to 85% (10.9) and, tied at 10.6, rolled oats and pistachios, which close the top 10 alongside dried figs (9.8) and cooked lentils (7.9). Cooked chickpeas (7.6) come just behind. Every value is from USDA SR Legacy and Foundation Foods.

What are the benefits of fiber?

The largest meta-analysis available, with 185 prospective studies and 58 clinical trials, found that for every extra 8 g of fiber a day the relative risk was 0.93 for all-cause mortality, 0.81 for coronary heart disease, 0.85 for type 2 diabetes and 0.92 for colorectal cancer (Reynolds et al., 2019, The Lancet). These are observational population associations, not an individual guarantee.

What happens if you eat fiber every day?

In controlled trials fiber significantly increased flatulence (SMD 0.80; 95% CI 0.47 to 1.13) and improved neither bloating nor abdominal pain (van der Schoot et al., 2022). In other words: it helps you go, but it produces more gas and it does not take the bloating away. No tolerable upper intake level has been set for dietary fiber, by EFSA or by the dietary reference intake system used in the United States. If you have a digestive condition or take medication, check with a healthcare professional before increasing your fiber.

Is soluble or insoluble fiber better for constipation?

The soluble or insoluble label predicts the result worse than the specific fiber does. The largest effect size in the van der Schoot (2022) meta-analysis belonged to psyllium, a soluble fiber that is highly viscous and poorly fermentable. On the insoluble side, the European Union authorizes the wording Wheat bran fibre contributes to an acceleration of intestinal transit, only for foods that qualify as HIGH FIBRE and on condition that the consumer is told the effect is obtained with 10 g a day of that fiber.

Which foods have soluble fiber and which have insoluble fiber?

Very few foods have that split actually measured. The Spanish Food Composition Database publishes neither soluble nor insoluble fiber for any food, and USDA measures it in only a handful. With real data: pear has 0.3 g soluble and 2.8 g insoluble per 100 g; kiwifruit, 0.7 and 2.3; dried figs, 1.5 and 8.3; and cooked broccoli is almost entirely insoluble fiber (USDA Foundation Foods, AOAC methods 991.42, 991.43 and 993.19).

What is a high fiber breakfast?

A breakfast of 40 g of rolled oats (4.2 g), one kiwifruit (3.0 g) and 30 g of almonds (3.8 g) adds up to about 11 g of fiber, almost half the 25 g a day set by EFSA. It is the meal with the most room to improve: in Spain breakfast supplies only 13.0% of the day's fiber, against 47.4% from the main meal (ANIBES study, 2017).

This content is informational and does not replace the advice of a healthcare professional. If you have a digestive condition, diabetes or you are on medication, check before changing your fiber intake.