Butternut squash is a moderate source of fiber, not a low-fiber food. One cup of cooked butternut squash contains about 6.6 grams of fiber, which supplies 7% to 10% of the daily recommended intake depending on your age and sex. That puts it solidly in the middle of the pack among vegetables, not at the bottom.
Whether that counts as “low” depends on why you’re asking. If you’re comparing it to high-fiber powerhouses like lentils or black beans (which pack 15+ grams per cup), butternut squash looks modest. But if you’re following a medically restricted low-fiber diet, the answer gets more nuanced.
How Much Fiber Is in a Serving
A one-cup serving of cooked, cubed butternut squash delivers roughly 6.6 grams of dietary fiber. For context, most adults need between 22 and 34 grams of fiber per day. Women aged 19 to 30 need about 28 grams daily, while men in the same age range need around 34 grams. So a single cup of butternut squash covers roughly a fifth to a quarter of a younger woman’s daily target.
That fiber comes in both forms your body uses. Soluble fiber dissolves into a gel-like substance during digestion, slowing things down and feeding beneficial gut bacteria as a prebiotic. Insoluble fiber adds bulk to stool and helps prevent constipation. Having both types in one food makes butternut squash a useful addition to a balanced diet, though not an exceptionally high-fiber one.
How It Compares to Similar Foods
Butternut squash sits in the same plant family as pumpkin, acorn squash, and hubbard squash, and their fiber content is similar. Sweet potatoes, often grouped alongside winter squash in recipes, tend to edge ahead on fiber. A comparable serving of sweet potato provides closer to 4 grams in a smaller portion, and a full cup of cooked sweet potato can exceed what butternut squash offers.
Compared to truly low-fiber vegetables like peeled cucumbers, iceberg lettuce, or well-cooked zucchini (all under 2 grams per cup), butternut squash has noticeably more. It’s closer to the fiber content of carrots or green beans than to low-fiber staples.
Butternut Squash on a Low-Fiber Diet
If you’ve been told to follow a low-fiber or low-residue diet, typically before a colonoscopy or during a flare of an inflammatory bowel condition, butternut squash can still be on the menu with some preparation. Clinical diet guidelines from the UK’s National Health Service list peeled, well-cooked butternut squash as an allowed food on a low-residue diet. The key is removing the skin and cooking it thoroughly, which softens the fiber structure and makes it easier to digest.
A sample meal on that type of diet might look like grilled fish with boiled potatoes and roasted butternut squash, all peeled. The goal isn’t to eliminate fiber entirely but to reduce it enough that your digestive system handles it comfortably. Butternut squash, once peeled and cooked soft, fits within those boundaries for most people on a restricted plan.
The Skin Changes the Equation
Most people peel butternut squash before cooking, but the skin is edible and significantly increases the fiber content. Leaving the peel on means your body digests the squash more slowly, which can be a benefit if you’re looking for more fiber, better blood sugar control, or longer-lasting fullness after a meal.
If you’re trying to keep fiber low, always peel it. If you’re trying to get more fiber into your diet without adding beans or bran, roasting butternut squash with the skin on is a simple way to boost your intake. The skin softens considerably when roasted at high heat, making it palatable rather than tough.
What This Means for Your Diet
Butternut squash lands in a middle zone that makes it flexible. At around 6.6 grams per cup (peeled), it’s not going to single-handedly meet your fiber goals, but it contributes meaningfully, especially alongside other vegetables, whole grains, or legumes. It also brings notable amounts of vitamin C, potassium, and vitamin A, all for about 75 calories per cup.
If you need to minimize fiber for medical reasons, peeled and well-cooked butternut squash is generally considered safe. If you’re looking for a high-fiber food to improve digestion or gut health, it’s a decent contributor but not a standout. Pairing it with higher-fiber foods will get you closer to your daily target without relying on any single ingredient to do the heavy lifting.