Beans and legumes, ranked by fiber
If you only change one thing about how you eat, make it this category. No other food gets close: a single cup of navy beans has more fiber than most people eat in an entire day. Beans are cheap, shelf-stable, high in protein, and the single fastest route from a 15-gram day to a 30-gram one.
Quick Answer
Ranked by fiber per cooked cup: navy beans (19.1g), adzuki beans (16.8g), split peas (16.3g), lentils (15.6g), pinto beans (15.4g), black beans (15g), lima beans (13.2g), chickpeas (12.5g), kidney beans (11.3g), black-eyed peas (11.2g), and edamame (8g). One cup of almost any of them delivers between a third and two thirds of a full day's fiber target.
The ranking
Approximate values per cooked cup, from USDA data.
| # | Legume | Fiber per cooked cup | Protein |
|---|---|---|---|
| 1 | Navy beans | ~19.1 g | ~15 g |
| 2 | Adzuki beans | ~16.8 g | ~17 g |
| 3 | Split peas | ~16.3 g | ~16 g |
| 4 | Lentils | ~15.6 g | ~18 g |
| 5 | Pinto beans | ~15.4 g | ~15 g |
| 6 | Black beans | ~15.0 g | ~15 g |
| 7 | Lima beans | ~13.2 g | ~15 g |
| 8 | Chickpeas | ~12.5 g | ~15 g |
| 9 | Kidney beans | ~11.3 g | ~15 g |
| 10 | Black-eyed peas | ~11.2 g | ~13 g |
| 11 | Refried beans | ~11 g | ~14 g |
| 12 | Baked beans | ~10 g | ~12 g |
| 13 | Green peas | ~8.8 g | ~8 g |
| 14 | Edamame | ~8.0 g | ~18 g |
| 15 | Peanuts (1 oz) | ~2.4 g | ~7 g |
Put that next to the rest of the food supply. The highest-fiber fruit serving on a typical ranking is around 8-12g, the highest vegetable around 9g, and a slice of good bread around 3g. A cup of navy beans beats all of them combined.
Canned vs dried
Canned beans are nutritionally very close to dried and vastly more likely to actually get eaten. The differences worth knowing:
- Sodium. Rinsing canned beans removes a meaningful share of it. Low-sodium versions exist and are worth buying.
- Texture. Dried beans hold shape better; canned are softer.
- Cost. Dried are much cheaper per serving, if you'll plan a soak.
- Fiber. Essentially the same. This is not a reason to choose one.
The best bean is the one in your cupboard. A rinsed can of black beans at 11pm beats a beautiful pot of dried beans you never make.
The gas problem, honestly
Beans contain oligosaccharides - raffinose and stachyose - which humans can't digest, so they arrive in the colon intact and your gut bacteria ferment them. Gas is the by-product. It's a sign the fiber is doing exactly what it's meant to, which is not comforting but is true.
What actually reduces it
Go gradually. Start with a quarter cup, not a full cup. Your bacterial population adapts over two to three weeks and the effect drops sharply.
Rinse canned beans thoroughly. Some of the oligosaccharides leach into the canning liquid.
Soak and discard the water for dried beans, then cook in fresh water.
Start with lentils or split peas. Generally the best tolerated of the group - they're also the fastest to cook, with no soaking.
Drink more water. Consistently underrated and consistently the fix.
Keep eating them. The single most effective intervention. People who eat beans regularly report far less trouble than people who eat them occasionally.
More in how to increase fiber without the gas.
Getting a cup a day without cooking a project
- Add half a can to whatever you already cook. Chickpeas into pasta sauce, black beans into rice, lentils into soup. No recipe change.
- Hummus as the default snack. Chickpeas, sesame, olive oil. A serving with vegetables is 4-6g.
- Lentil soup, cooked once, eaten four times. No soaking, ready in half an hour. See high-fiber meal prep.
- Roasted chickpeas instead of crisps. Tin, oil, salt, hot oven, 25 minutes.
- Beans at breakfast. Unfamiliar in the US, standard in half the world, and it front-loads your day with 8-10g.
What else beans bring
Fiber is the headline, but the rest of the profile is why legumes show up in nearly every long-term dietary pattern associated with better outcomes: substantial plant protein, iron, folate, potassium, magnesium, a low glycemic response, and a cost per serving that undercuts almost everything else in the shop.
If you have IBS or you're following a low-FODMAP protocol, note that legumes are high-FODMAP and specific portion guidance applies - canned and rinsed chickpeas in small servings are often better tolerated. Talk to a dietitian rather than guessing.
Frequently Asked Questions
Which beans have the most fiber?
Navy beans lead at roughly 19.1g per cooked cup, followed by adzuki beans at about 16.8g, split peas at 16.3g, and lentils at 15.6g. Black and pinto beans, which are far more common in everyday cooking, both land around 15g per cup. Any of them delivers between a third and two thirds of a full day's fiber target in a single serving.
Are canned beans as high in fiber as dried?
Yes, essentially - canning doesn't meaningfully reduce fiber. The real differences are sodium, which you can cut substantially by rinsing, and cost, where dried beans are considerably cheaper per serving. For most people canned beans are the better choice simply because they get eaten, and the best bean is the one that's actually in your cupboard.
How do I eat beans without getting gas?
Increase gradually - start with a quarter cup rather than a full cup and build over two to three weeks while your gut bacteria adapt. Rinse canned beans thoroughly, discard the soaking water for dried beans, drink more water, and start with lentils or split peas, which are usually the best tolerated. Counterintuitively, eating beans regularly reduces the problem far more than eating them occasionally.
How much fiber is in a cup of black beans?
About 15 grams, along with roughly 15 grams of protein. That's more than half the 28g Daily Value from a single serving, and more than the average US adult gets from their entire day. It's also the reason a bean-based meal is the fastest single change available if you're trying to close a fiber gap.
Related Articles
- The 20 Highest-Fiber Vegetables, Ranked
- The 20 Highest-Fiber Fruits, Ranked
- How to Increase Fiber Without the Gas
- The High-Fiber Foods List
- High-Fiber Meal Prep
- High-Fiber Fast Food: The Best Orders
Scope
Fiber values are approximate and drawn from USDA FoodData Central and standard nutrition references; actual amounts vary by variety, ripeness, portion size, and preparation. This article is general nutrition information, not medical advice - if you have IBS, IBD, diverticular disease, a history of bowel obstruction, or you are on a prescribed diet, talk to your doctor or a registered dietitian before making big changes. FiberUp is made by the author of this site.