Green peas, artichokes, Brussels sprouts, and broccoli consistently rank among the highest-fiber vegetables you can eat. Most Americans fall well short of the recommended fiber intake, which sits at 14 grams for every 1,000 calories you consume daily. Loading your plate with the right vegetables is one of the simplest ways to close that gap.
The Highest-Fiber Vegetables by Serving
Green peas lead the pack among common vegetables, delivering about 9 grams of fiber per cooked cup. That’s roughly a third of what most adults need in a day from a single side dish. Artichokes follow closely, with a medium cooked artichoke providing around 7 grams. Both are easy to work into meals and offer a mix of soluble and insoluble fiber.
After those two standouts, several vegetables cluster in the 4 to 6 gram range per cup cooked: Brussels sprouts, broccoli, turnip greens, sweet potatoes, and lima beans (technically a legume, but often eaten as a vegetable side). Lima beans pack about 5.2 grams per 100 grams, with most of that coming from insoluble fiber. Corn, another staple, contributes around 4.2 grams per 100 grams, almost entirely insoluble.
Cruciferous Vegetables: Brussels Sprouts vs. Broccoli
If you’re choosing between cruciferous options, Brussels sprouts win on fiber. A cup of raw Brussels sprouts contains 3.8 grams of fiber (14% of the daily value), compared to 2.6 grams for the same amount of raw broccoli (9% of the daily value). That gap holds up after cooking, too.
Broccoli has a slightly different fiber profile that’s worth knowing about. Per 100 grams cooked, broccoli delivers 1.85 grams of soluble fiber and 2.81 grams of insoluble fiber, a roughly 40/60 split. That’s a notably high proportion of soluble fiber compared to most vegetables. Soluble fiber dissolves in water and forms a gel-like substance that slows digestion, which helps with blood sugar control and cholesterol. Insoluble fiber adds bulk to stool and keeps things moving. Both types matter, and eating a variety of vegetables covers both.
Root Vegetables Worth Adding
Root vegetables don’t always get credit as fiber sources, but some deserve a spot on your plate. Parsnips are the standout here: half a cup of boiled parsnips delivers 3 grams of fiber for just 63 calories. That’s a better fiber-to-calorie ratio than carrots, which typically provide about 2 grams per half cup cooked. Sweet potatoes also perform well, with a medium baked sweet potato (skin on) offering around 4 grams.
The skin matters. Potato and sweet potato skins contain a concentrated layer of fiber, so leaving the skin on when you roast or bake them gives you a measurable boost over peeled versions.
How Cooking Affects Fiber Content
A common concern is whether cooking destroys fiber the way it can damage certain vitamins. The short answer: total fiber holds up well through cooking. Research on cruciferous vegetables found that steaming and boiling did not significantly reduce overall dietary fiber in Brussels sprouts, broccoli, or cauliflower.
What does shift is the ratio between fiber types. Cooking decreases the concentration of insoluble fiber while increasing soluble fiber. The total stays roughly the same, but the balance changes. From a practical standpoint, this means cooked vegetables aren’t inferior to raw ones for fiber. Whether you steam, boil, or microwave your broccoli, you’re getting comparable fiber. Both steaming and boiling had a similar impact on these changes, so pick whichever method you prefer.
Getting More Fiber Without the Bloating
If your current diet is low in fiber, jumping straight to multiple cups of Brussels sprouts and artichokes per day will likely cause gas, bloating, and cramping. Your gut bacteria need time to adjust. The Mayo Clinic recommends increasing fiber gradually over a few weeks rather than all at once.
Water intake matters just as much as the fiber itself. Fiber works by absorbing water in your digestive tract, which makes stool softer and easier to pass. Without enough water, high fiber intake can actually make constipation worse. There’s no magic ratio, but if you’re noticeably increasing your vegetable intake, increase your water intake alongside it.
A practical approach: add one new high-fiber vegetable per week. Start with a cooked option like steamed broccoli or roasted Brussels sprouts, since cooking softens the cell walls and can make fiber easier to tolerate initially. Once your system adjusts, raw vegetables and higher-fiber choices like artichokes become easier to handle.
Quick Fiber Comparison by Vegetable
- Green peas (1 cup cooked): ~9 g fiber
- Artichoke (1 medium, cooked): ~7 g fiber
- Lima beans (1 cup cooked): ~5–6 g fiber
- Brussels sprouts (1 cup raw): 3.8 g fiber
- Parsnips (½ cup boiled): 3 g fiber
- Broccoli (1 cup raw): 2.6 g fiber
- Corn (1 cup): ~4 g fiber
- Sweet potato (1 medium, skin on): ~4 g fiber
- Carrots (½ cup cooked): ~2 g fiber
Mixing several of these into your daily meals can easily get you to 10 or more grams of fiber from vegetables alone, leaving less work for grains, beans, and fruit to fill the rest of your daily target.