In this article
- Does zucchini have fiber? The numbers by portion
- Zucchini noodles vs pasta: what happens to fiber
- Zucchini next to other vegetables with fiber
- What zucchini does bring to the table
- Zucchini and your digestion
- Five ways to get more fiber from a zucchini dish
- How zucchini fits your daily target
- The limit of leaning on zucchini
- Common questions about zucchini and fiber
- Sources
Swapping spaghetti for spiralized zucchini sounds like a fiber win. It usually isn’t. A cup of cooked whole wheat spaghetti has about 5.9 grams of fiber, while two full cups of raw zucchini have about 2.3 grams.
So does zucchini have fiber? Yes, but not much. USDA FoodData Central lists raw zucchini at 1 gram of fiber per 100 grams, because almost 95% of the vegetable is water.
That doesn’t make zucchini a poor choice. It just means its job on your plate is different from what many people assume.
Does zucchini have fiber? The numbers by portion
Zucchini’s fiber barely shifts between raw and cooked. USDA lists both raw and boiled zucchini at 1.0 gram per 100 grams.
| Zucchini | Amount | Fiber | % Daily Value | Calories |
|---|---|---|---|---|
| Raw, sliced | 1 cup (113 g) | 1.1 g | 4% | 19 |
| Raw | 100 g | 1.0 g | 4% | 17 |
| Raw, medium | about 196 g | 2.0 g | 7% | 33 |
| Boiled, sliced | 1 cup (100 g) | 1.0 g | 4% | 15 |
| Raw, spiralized | 2 cups (226 g) | 2.3 g | 8% | 38 |
The Daily Value for fiber is 28 grams, per the FDA. Even a whole medium zucchini supplies only about 7% of it.
Smaller amounts barely register. A handful of raw slices tossed into a salad, about 50 grams, adds roughly half a gram.
The medium weight here comes from the FDA’s raw vegetable nutrition poster, which uses half a medium summer squash, 98 grams, as its serving. Double that and you have a typical whole zucchini.
Why the FDA poster shows a higher number
That same FDA poster lists 2 grams of fiber for half a medium summer squash. USDA’s lab data for zucchini specifically comes in closer to 1 gram for the same weight.
The poster covers summer squash as a group, and its values are rounded for labels. For zucchini on its own, the USDA figure of about 1 gram per 100 grams is the safer number to plan with.
Zucchini noodles vs pasta: what happens to fiber
Picture a weeknight bowl of spaghetti and four ways to build it. USDA data puts them side by side like this:
| Bowl | Fiber | Calories |
|---|---|---|
| 1 cup whole wheat spaghetti | 5.9 g | 225 |
| 2 cups zucchini noodles | 2.3 g | 38 |
| ½ cup whole wheat spaghetti + 1 cup zucchini | 4.1 g | 132 |
| 2 cups zucchini noodles + ½ cup chickpeas | 8.6 g | 173 |
Going all zoodle cuts about 187 calories but also drops more than half the fiber. The half and half bowl keeps most of the fiber while trimming roughly 90 calories.
The half and half approach is easy to pull off. Spiralize one zucchini, cook half your usual pasta and toss them together in the sauce so the noodles blend.
The real fiber upgrade is the last one. Toss zucchini noodles with half a cup of chickpeas, at 6.3 grams in the Dietary Guidelines’ fiber table, and the bowl lands at 8.6 grams, more than the whole wheat pasta alone.
Looking for pasta nights that blend zucchini with beans and whole grains? Our recipe eBooks have high-fiber versions worth trying.
Zucchini next to other vegetables with fiber
Among cooked vegetables, zucchini sits near the bottom for fiber. The Dietary Guidelines list these amounts per cooked cup, with USDA’s boiled zucchini added for comparison:
| Cooked vegetable (1 cup) | Fiber | Calories |
|---|---|---|
| Broccoli | 5.2 g | 54 |
| Cauliflower | 4.9 g | 34 |
| Green beans | 4.0 g | 44 |
| Mushrooms | 3.4 g | 44 |
| Asparagus | 2.9 g | 32 |
| Zucchini, boiled | 1.0 g | 15 |
A cup of cooked broccoli has five times the fiber of a cup of boiled zucchini. Cauliflower, with only 34 calories per cup, still carries nearly five times as much.
Part of the gap is weight. A cup of boiled zucchini slices weighs about 100 grams in USDA data, so it holds less food than a cup of denser vegetables.
Per calorie, zucchini looks better. Raw zucchini has about 5.9 grams of fiber per 100 calories, which beats cooked barley and bulgur even though it trails broccoli and cauliflower.
How the FDA’s raw vegetable poster compares
The FDA’s poster uses typical raw servings rather than cups, which gives a different angle on the same question. Rounded label values look like this:
| Raw vegetable (FDA serving) | Fiber | Calories |
|---|---|---|
| Green beans, ¾ cup (83 g) | 3 g | 20 |
| Broccoli, 1 medium stalk (148 g) | 3 g | 45 |
| Summer squash, ½ medium (98 g) | 2 g | 20 |
| Celery, 2 medium stalks (110 g) | 2 g | 15 |
| Cauliflower, ⅙ medium head (99 g) | 2 g | 25 |
| Cucumber, ⅓ medium (99 g) | 1 g | 10 |
| Mushrooms, 5 medium (84 g) | 1 g | 20 |
On this list, summer squash holds its own against celery and cauliflower and beats cucumber. Raw green beans still deliver more fiber for the same 20 calories.
What zucchini does bring to the table
If fiber isn’t zucchini’s strong suit, vitamin C is. A cup of sliced raw zucchini has about 20 mg of vitamin C, roughly 22% of the Daily Value, and a whole medium zucchini reaches about 39%. That’s a generous dose of vitamin C for under 20 calories per cup, and raw slices hold on to more of it than boiled ones do.
Per cup of raw slices, USDA also lists:
- Potassium: 295 mg, about 6% of the Daily Value
- Vitamin B6: 0.18 mg, about 11% of the Daily Value
- Manganese: 0.20 mg, about 9% of the Daily Value
- Riboflavin: 0.11 mg, about 8% of the Daily Value
- Protein: 1.4 g with only 3.5 g of carbohydrate
Cooking changes the vitamin picture a little. Boiled zucchini has less vitamin C per 100 grams than raw, 12.9 mg versus 17.9 mg, but more vitamin A, 56 µg versus 10 µg, in USDA data.
Zucchini’s water content is a benefit of its own. Mayo Clinic notes that fiber works best when it absorbs water, and a vegetable that’s 95% water brings a little fluid along with whatever fiber you pair it with.
Zucchini and your digestion
Mayo Clinic explains that fiber normalizes bowel movements by adding bulk and softening stool. At about 1 gram per cup, zucchini contributes only a small amount toward that on its own.
Where zucchini helps is as a light base. It adds volume to meals that already carry beans, whole grains or higher fiber vegetables, without crowding them out.
If you’re increasing fiber overall, Mayo Clinic suggests doing it slowly over a few weeks and drinking plenty of water. A gradual approach gives your digestive system time to adjust.
Building a gut friendly routine one swap at a time? Our gut health guides break the process into simple steps.
Five ways to get more fiber from a zucchini dish
Since zucchini won’t carry the fiber load by itself, give it a partner. Each of these adds a measurable amount, using Dietary Guidelines figures:
- Stir in chickpeas: ½ cup adds 6.3 grams to a zucchini sauté or pasta.
- Add white beans to soup: ½ cup of navy beans adds 9.6 grams to a zucchini minestrone.
- Mix in green peas: a cup of cooked peas adds 8.8 grams to a zucchini skillet.
- Serve over bulgur: ½ cup of cooked bulgur adds 4.1 grams under roasted zucchini.
- Keep some pasta: half a cup of whole wheat spaghetti adds about 3 grams to a bowl of zoodles.
Any one of these turns a 1 gram side into a dish worth counting. Two of them together can push a single meal past 10 grams, such as chickpeas and bulgur under a cup of roasted zucchini at roughly 11.5 grams.
How zucchini fits your daily target
Picture a late summer garden that hands you one medium zucchini a day. Eat all seven over a week and you’ve added about 14 grams of fiber, half of a single day’s Daily Value spread across seven days.
That’s a useful bonus, but it shows why zucchini can’t anchor your intake. The same 14 grams comes from about one cup of cooked lentils or black beans.
Mayo Clinic recommends 25 grams of fiber daily for women and 38 grams for men up to age 50, and 21 and 30 grams after 50. A cup of raw zucchini covers about 4% of the women’s goal and 3% of the men’s.
Want to see how far a few vegetable swaps move your own daily total? Our fiber calculator sets your target in a couple of steps.
The limit of leaning on zucchini
Zucchini’s biggest limit as a fiber food is scale. You’d need about 2.8 kilograms of it, roughly 14 medium zucchini, to reach the 28 gram Daily Value on its own.
That’s why the strongest zucchini meals treat it as a sidekick. Let it bring volume, vitamin C and very few calories, and let beans, whole grains or peas bring the fiber.
When you do cook a big batch, like a full sheet pan of roasted slices, count roughly 1 gram of fiber for every 100 grams of raw zucchini that went on the tray. The number won’t change much however you cook it.
Common questions about zucchini and fiber
How much fiber is in one zucchini?
About 2 grams in a medium zucchini of roughly 196 grams. That’s around 7% of the Daily Value for about 33 calories.
Is zucchini high in fiber?
No. A cup of sliced raw zucchini has about 1.1 grams, or 4% of the Daily Value, well below the FDA’s 20% mark for a high source.
Are zucchini noodles high in fiber?
Not really. Two cups of spiralized zucchini have about 2.3 grams of fiber, compared with about 5.9 grams in a cup of cooked whole wheat spaghetti.
Does cooking zucchini change its fiber?
Barely. USDA lists both raw and boiled zucchini at about 1 gram of fiber per 100 grams.
Is zucchini good for constipation?
It can help a little, but it isn’t a strong fiber source. Pair it with beans, peas or whole grains and plenty of water for a bigger effect.
How many calories are in a cup of zucchini?
About 19 calories in a cup of sliced raw zucchini and about 15 in a cup of boiled slices. That makes it one of the lightest vegetables you can add to a meal.
Is zucchini a low carb vegetable?
Yes. Raw zucchini has about 3.1 grams of carbohydrate per 100 grams, including about 1 gram of fiber.
Sources
- U.S. Department of Agriculture, Agricultural Research Service. “Squash, summer, zucchini, includes skin, raw (169291); cooked, boiled, drained (169292); Pasta, whole-wheat, cooked (168910).” FoodData Central, SR Legacy. 2019. fdc.nal.usda.gov
- U.S. Food and Drug Administration. “Nutrition Information for Raw Vegetables.” 2017. www.fda.gov
- U.S. Department of Agriculture and U.S. Department of Health and Human Services. “Food Sources of Dietary Fiber.” Dietary Guidelines for Americans, 2020 to 2025. dietaryguidelines.gov
- Mayo Clinic Staff. “Dietary fiber: Essential for a healthy diet.” Mayo Clinic, 2025. www.mayoclinic.org
- U.S. Food and Drug Administration. “Daily Value on the Nutrition and Supplement Facts Labels.” 2024. www.fda.gov
