Spaghetti Squash Glycemic Index
Low GI · The honest verdict
Gentle on blood sugar
Glycemic index
20–30
reported range
Glycemic load
3
Low GL
This food's glycemic index is 20–30, which is Low GI.
Spaghetti squash has a low GI and a low glycemic load, making it a realistic and well-supported pasta substitute for people managing blood sugar. One cup cooked contains about 8 grams of net carbs compared to roughly 40 grams in a cup of regular spaghetti — a dramatic reduction. This is general nutrition information, not medical advice; people with diabetes should confirm dietary choices with their care team.
GI numbers vary by source, ripeness, and how a food is prepared. This is general nutrition information — not medical advice. If you manage diabetes, confirm specifics with your care team.
Key facts
One cup of cooked spaghetti squash has about 10 grams of total carbs — versus roughly 43 grams in a cup of cooked wheat spaghetti.
Low GI is defined as 55 or below; spaghetti squash, estimated at 20–30, is among the lower-GI winter squash options.
Glycemic load factors in portion size — spaghetti squash has a GL of about 3 per cup, classified as low (10 or below).
What's actually inside
Per 100 g, with your typical serving noted as 1 cup cooked, shredded (155 g). The carb family is what moves blood sugar — fiber is the number that softens the spike.
Total carbs
10g
Net carbs
7.8g
total carbs minus fiber
Fiber
2.2g
slows the glucose rise
- Sugars
- 3.9g
- Protein
- 1g
- Calories
- 42kcal
Notable nutrients
- Vitamin C5 mg
- Vitamin B60.15 mg
- Potassium181 mg
- Manganese0.2 mg
- Pantothenic acid (B5)0.6 mg
Is it a smart choice for blood sugar?
GI is only half the story — portion (glycemic load) and what you eat it with decide the real-world effect. Here's the honest read.
The verdict
A genuinely good pasta alternative for blood sugar
Spaghetti squash has a low GI and a low glycemic load, making it a realistic and well-supported pasta substitute for people managing blood sugar. One cup cooked contains about 8 grams of net carbs compared to roughly 40 grams in a cup of regular spaghetti — a dramatic reduction. This is general nutrition information, not medical advice; people with diabetes should confirm dietary choices with their care team.
Portion guidance
A one-cup serving of cooked spaghetti squash is a reasonable portion with a low glycemic impact. Two cups — which can feel like a full pasta meal — still provides only about 15 grams of net carbs, far less than wheat pasta. Top with protein-rich sauces (meat sauce, pesto with cheese) to slow digestion further.
This is general nutrition information, not personal medical advice. Blood sugar responses are individual — if you have diabetes or prediabetes, your care team can tell you how this fits your plan.
How to keep the spike small
The same food can land differently depending on how it's cooked and what it's eaten with. Use these levers to your advantage.
Roasting until tender
Raises GILonger roasting softens the squash and caramelizes some natural sugars slightly, which can nudge the GI upward compared to al-dente texture — though it stays firmly in the low range.
Keeping some firmness (not overroasting)
Lowers the spikeLess cooking preserves more fiber integrity and keeps starch digestion slower, maintaining a lower glycemic response — similar to cooking pasta al dente.
Adding fat-rich sauces (pesto, olive oil, cheese)
Lowers the spikeFat slows gastric emptying, blunting the glucose curve from any carbs in the squash and producing a steadier post-meal blood sugar pattern.
Sweet sauces or glazes
Raises GIHoney, teriyaki, or fruit-based sauces add fast-digesting sugar to an otherwise low-GI base — the squash is not the issue, the sauce is.
Pairing tip
Treat spaghetti squash as you would pasta: top with a protein-rich meat sauce, pesto, or marinara (watch for added sugar in jarred marinara) to make a satisfying, low-GI meal. Adding a side salad with olive oil and vinegar (acidity lowers post-meal glucose) rounds out the plate well.
Why GI numbers vary
GI studies on spaghetti squash specifically are limited. The estimated range of 20–30 is derived from its carbohydrate and fiber profile relative to other winter squashes and from the general principle that non-starchy squashes with high water content and intact fiber are consistently low-GI. It is lower in carbs than butternut or acorn squash, which supports a lower GI estimate. We give a range rather than a precise number because lab-specific data is not available for this exact food.
Not medical advice. This page is general nutrition information about Spaghetti Squash. It isn't a diagnosis or a treatment plan. If you have diabetes, prediabetes, or another condition affecting blood sugar, confirm any dietary decisions with your doctor or care team.
❓Frequently Asked Questions
Spaghetti squash has an estimated glycemic index in the range of 20–30, placing it in the low-GI category (55 and below). Dedicated GI studies on this specific squash are scarce, so a range is more honest than a single number. Its relatively low carbohydrate content (about 10 grams total per cup cooked) and decent fiber make it consistently among the lower-GI winter squash options.
Yes — it is one of the better pasta substitutes from a glycemic standpoint. One cup of cooked spaghetti squash contains about 8 grams of net carbs, compared to roughly 40 grams in a cup of regular wheat spaghetti. Its low GI and low glycemic load make it genuinely supportive of blood-sugar management as a pasta substitute. People with diabetes should still pay attention to what sauces they add, and confirm dietary changes with their care team.
Spaghetti squash is dramatically better for blood sugar than wheat pasta: roughly 8 grams of net carbs per cup versus 38–40 grams for regular spaghetti, and a GI around 20–30 versus 45–60 for pasta. This means both less total carbohydrate and a slower glucose rise per gram of carb eaten. For people managing blood sugar or simply reducing carbs, it is a meaningful substitution — though portion size and sauce still matter.
Only modestly. A one-cup serving has a glycemic load of about 3 — very low. Even two cups produces a glycemic load of around 6, still in the low range. Blood-sugar impact is real but small compared to wheat pasta or most grains. The sauce and any added ingredients (bread, sugary condiments) will typically have a larger glycemic impact than the squash itself.
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Reviewed by
Curex Editorial TeamReviewed for accuracy
Last reviewed July 2026