Spaghetti squash: a lighter plate on indirect evidence

As a pasta swap, spaghetti squash rests on indirect evidence. In a randomized crossover trial in 41 adults, entrees made less energy dense with puréed vegetables cut daily intake by 202 to 357 calories, and a similar trial in 40 preschool children cut daily energy by 142 calories (12%), a result on test days, not evidence that less energy is good for a growing child. Both hid mixed vegetables in lab meals on single days, and neither tested spaghetti squash. The swap itself is a comparison of USDA survey records. A 155 g cup of cooked squash gives about 76 calories and 9.7 g of carbohydrate, and a 140 g cup of cooked pasta about 220 calories and 43 g. The squash record may include added fat, and equal volume does not mean equal fullness.

The numbers, per 3.5 oz (100 g)

As people eat it, per 3.5 oz (100 g)

How much is actually in it

• In 8 USDA samples, raw spaghetti squash held 5.6 mg vitamin C and 267 mg potassium per 3.5 oz (100 g), with vitamin C ranging threefold between samples. — 8 samples, USDA Foundation Foods, raw peeled seeded spaghetti squash (n = 8) Evidence E source
  Vitamin C 5.554 mg (3.0 to 9.57); potassium 266.9 mg (189.0 to 348.5); water 92.78 g per 3.5 oz (100 g)
• USDA samples of raw spaghetti squash had 1.4 g fiber per 3.5 oz (100 g) and about 2.7 g of simple sugars (glucose plus fructose). — 8 samples, USDA Foundation Foods, raw peeled seeded spaghetti squash (n = 8) Evidence E source
  Fiber 1.4 g (1.1 to 1.8); glucose 1.465 g (0.83 to 1.99); fructose 1.281 g (0.82 to 1.69) per 3.5 oz (100 g)
• UK food tables give raw spaghetti squash 26 calories, 2 mg vitamin C and 110 mg potassium per 3.5 oz (100 g), well below the USDA sample values for vitamin C and potassium. — CoFID 2021 record 13-357 (Squash, spaghetti, raw) (n = 1 record) Evidence E source
  Energy 26 calories; carbohydrate 4.6 g; total sugars 3.6 g; vitamin C 2 mg; potassium 110 mg per 3.5 oz (100 g)

What a real portion looks like

• US dietary surveys count a cup of cooked spaghetti squash as 155 g and an unspecified serving as 78 g. — FNDDS record Spaghetti squash, cooked (food code 75233220, FDC 2710001), WWEIA Other red and orange vegetables (n = 2 portion measures) Evidence E source
  1 cup = 155 g; quantity not specified = 78 g
• As a pasta swap, a 155 g cup of cooked spaghetti squash gives about 76 calories and 9.7 g carbohydrate, against about 220 calories and 43 g in a 140 g cup of cooked pasta in USDA survey data. — FNDDS records Spaghetti squash, cooked (FDC 2710001) and Pasta, cooked (FNDDS 56130000, FDC 2708357) (n = 2 records) Evidence E source
  Per cup: 76 vs 220 calories; 9.7 vs 43.0 g carbohydrate; per 3.5 oz (100 g) 49 vs 157 calories

What your body absorbs

• We found no measured glycemic index for spaghetti squash, no study of how well its nutrients are absorbed and no human trial on the squash itself. — — (n = 0 studies) Evidence E source
  Zero PubMed records by name in the local corpus; Europe PMC lists only 2 food chemistry papers (juice, peel pectin); no GI measurement; no US 21 CFR or EU register claim

What cooking and storage change

• UK food tables list baked spaghetti squash at 23 calories and 4.3 g carbohydrate per 3.5 oz (100 g), close to the raw values. — CoFID 2021 record 13-358 (Squash, spaghetti, baked) (n = 1 record) Evidence E source
  Energy 23 calories; carbohydrate 4.3 g; total sugars 3.4 g; potassium 120 mg; vitamin C 3 mg; water 92.3 g per 3.5 oz (100 g)
• USDA retention factors for baked vegetables in general keep 85% of vitamin C and folate and all of the potassium. — USDA R6 group Vegetables and Vegetable Products, method VEG,OTHER,BAKED Evidence E source
  Vitamin C 85%, folate 85%, thiamin 90%, vitamin B6 95%, potassium 100% retained

What it does to your health

• Lowering the energy density of meals with vegetables cut intake in a laboratory trial. In a randomized crossover trial in 41 adults, vegetable-rich entrees reduced daily intake by 202 to 357 calories. — 20 men and 21 women, ad libitum meals one day a week for 3 weeks (n = 41) Evidence B source
  Daily energy intake -202 ± 60 calories (85% energy density) and -357 ± 47 calories (75%); hunger and fullness unchanged
• In a randomized crossover trial in 40 preschoolers, vegetable-rich entrees cut daily energy intake by 142 calories (12%). — 40 children aged 3-5 years, all meals one day a week for 3 weeks (n = 40) Evidence B source
  Vegetable intake +73 g (73%); energy intake -142 calories (12%) at 75% energy density

Safety, limits and interactions

• A case report described hemorrhagic colitis and low blood pressure in a woman after eating a bitter zucchini, a squash of the same species, from cucurbitacin poisoning. — One 66-year-old woman, Germany (n = 1) Evidence D source
  Tachycardia, hypotension, bloody diarrhea; recovered in 2 days on IV fluids
• In 25 Turkish children with pumpkin seed allergy, 64% had anaphylaxis, yet all of them tolerated pumpkin flesh. — 25 children diagnosed at a tertiary allergy clinic, Turkey, 2016 to 2024 (n = 25) Evidence D source
  Anaphylaxis 64%; pumpkin pulp tolerated in 100%

The bottom line

Raw spaghetti squash is mostly water, 92.78 g per 3.5 oz (100 g) across 8 USDA samples. The same samples held 5.6 mg of vitamin C, ranging from 3.0 to 9.57 mg, and 267 mg of potassium per 3.5 oz (100 g). UK tables list much less, 2 mg of vitamin C and 110 mg of potassium, a gap that reflects different varieties and samples. Fiber runs at 1.4 g per 3.5 oz (100 g) and simple sugars at about 2.7 g. Baking changes little in the UK records, 23 calories and 4.3 g of carbohydrate per 3.5 oz (100 g) baked against 26 calories and 4.6 g raw. USDA factors for baked vegetables in general keep 85% of vitamin C and all the potassium. We found no measured glycemic index for spaghetti squash and no human trial on the squash itself. A case report describes a 66-year-old woman with bloody diarrhea and low blood pressure after eating a bitter zucchini, a squash of the same species, from cucurbitacin poisoning. She recovered in 2 days on fluids. It was one case and a zucchini, and the report names bitter taste as the key sign. Pumpkin seed allergy is a separate matter. In 25 Turkish children with that allergy, 64% had anaphylaxis, and all of them tolerated pumpkin flesh. We found no evidence on pregnancy or medicines for this squash.

Sources

1. spsq-daily-r3-01 · dataset
   Squash, spaghetti, peeled, seeded, raw (Foundation Foods 2026-04-30): Vitamin C, total ascorbic acid 5.554 MG, range 3.0-9.57, median 5.1, samples 8; Potassium, K 266.9 MG, range 189.0-348.5, median 264.0, samples 8; Water 92.78 G, range 89.92-94.3, samples 8
   USDA FoodData Central, Foundation Foods, release 2026-04-30, FDC 2727579 (Squash, spaghetti, peeled, seeded, raw) · checked 2026-09-29
2. spsq-daily-r3-02 · dataset
   Squash, spaghetti, peeled, seeded, raw (Foundation Foods 2026-04-30): Fiber, total dietary 1.4 G, range 1.1-1.8, samples 8; Glucose 1.465 G, range 0.83-1.99, samples 8; Fructose 1.281 G, range 0.82-1.69, samples 8
   USDA FoodData Central, Foundation Foods, release 2026-04-30, FDC 2727579 (Squash, spaghetti, peeled, seeded, raw) · checked 2026-09-29
3. spsq-daily-r3-03 · dataset
   Squash, spaghetti, raw (13-357): Energy 26 kcal, Carbohydrate 4.6 g, Total sugars 3.6 g, Potassium 110 mg, Vitamin C 2 mg
   CoFID 2021, Public Health England, codes 13-357 and 13-358 · checked 2026-09-29
4. spsq-daily-r3-06 · dataset
   Spaghetti squash, cooked (FNDDS 75233220): 1 cup 155 g; Quantity not specified 78 g
   USDA FNDDS 2021-2023, food code 75233220 (Spaghetti squash, cooked, FDC 2710001) · checked 2026-09-29
5. spsq-daily-r3-09 · dataset
   Spaghetti squash, cooked (FDC 2710001): Energy 49 kcal, Carbohydrate 6.26 g, Fiber 1.4 g per 100 g; 1 cup 155 g = 76.0 kcal, 9.7 g carbohydrate, 2.2 g fiber. Pasta, cooked (FDC 2708357): Energy 157 kcal, Carbohydrate 30.68 g per 100 g; 1 cup cooked 140 g = 219.8 kcal, 43.0 g carbohydrate.
   USDA FNDDS 2021-2023, food codes 75233220 (FDC 2710001) and 56130000 (FDC 2708357) · checked 2026-10-02
6. spsq-daily-r3-12 · dataset
   corpus_search spaghetti squash: 0 records in all layers. claims_search spaghetti squash: 21 CFR 101 nothing. euclaims_search spaghetti squash: EU register nothing. ctgov_search spaghetti squash: nothing.
   Local PubMed corpus (pubmed:469385) and USDA FoodData Central, searched 2026-10-02 · checked 2026-10-02
7. spsq-daily-r3-04 · dataset
   Squash, spaghetti, baked (13-358): Energy 23 kcal, Carbohydrate 4.3 g, Total sugars 3.4 g, Water 92.3 g, Potassium 120 mg, Vitamin C 3 mg
   CoFID 2021, Public Health England, codes 13-357 and 13-358 · checked 2026-09-29
8. spsq-daily-r3-05 · dataset
   USDA-RETN-R6:3771 VEG,OTHER,BAKED: vitamin_c_mg 85%; folate_total_ug 85%; thiamin_mg 90%; vitamin_b6_mg 95%; potassium_mg 100%
   USDA Table of Nutrient Retention Factors, Release 6 (2007), Retn_Code 3771 VEG,OTHER,BAKED · checked 2026-09-29
9. spsq-daily-r3-10 · randomized crossover trial
   In this crossover study, 20 men and 21 women ate ad libitum breakfast, lunch, and dinner in the laboratory once a week for 3 wk. ... Subjects consumed a consistent weight of foods across conditions of energy density; thus, the daily energy intake significantly decreased by 202 ± 60 kcal in the 85% condition (P < 0.001) and by 357 ± 47 kcal in the 75% condition (P < 0.0001).
   Am J Clin Nutr, 2011 · checked 2026-10-02
10. spsq-daily-r3-11 · randomized crossover trial
    In this crossover study, 3- to 5-y-old children (n = 40) were served all meals and snacks 1 d/wk for 3 wk. ... Children ate similar weights of food across conditions; thus, the daily energy intake decreased by 142 kcal (12%) from the 100% to 75% ED conditions (P < 0.05).
    Am J Clin Nutr, 2011 · checked 2026-10-02
11. spsq-daily-r3-07 · case report
    A 66-year-old female patient was admitted to the emergency department following bitter zucchini ingestion. Clinical symptoms were tachycardia, hypotension, somnolence, diarrhea, hematochezia as well as exsiccosis, nausea and emesis. ... Bitter taste is essential to diagnose cucurbitacin intoxications.
    Dtsch Med Wochenschr, 2020 · checked 2026-09-29
12. spsq-daily-r3-08 · case series
    Twenty-five children (76% boys) were identified, with a median diagnosis age of 2.98 years. Immediate reactions were universal, and anaphylaxis occurred in 64%. ... Pumpkin pulp was tolerated in all the patients.
    Allergy Asthma Proc, 2026 · checked 2026-09-29