Wonton soup: a light bowl with a heavy dose of salt

A cup of wonton soup, 245 g, gives about 81 calories, 5.9 g of protein and 907 mg of sodium in US survey data, recalculated from 100 g values. That is close to 40% of the 2,300 mg a day the 2025-2030 US Dietary Guidelines set as the ceiling from age 14, and about three quarters of the 1,200 mg ceiling for a child aged 1 to 3. The only USDA record for restaurant wonton soup lists 406 mg of sodium per 3.5 oz (100 g), with no published spread between restaurants. The bowl also carries allergens that are easy to miss. Of 18 packaged wonton soups in USDA's branded food data, all list wheat, 17 list soy, 13 shrimp, 12 sesame and 6 egg. Wonton dough is always wheat but not always egg. A restaurant bowl comes with no required allergen list, because the FDA labeling law does not cover most food that is not pre-packaged. Starting a meal with soup can shrink that meal. In a crossover trial on 60 normal-weight adults, a vegetable soup before a lab lunch cut total meal energy by 20%, about 134 calories, though only that one meal was measured. We found no trial that tested wonton soup this way. A second trial, in 32 lean young men in Singapore, found that lower-energy broths led to a larger lunch afterward, while total intake over the day came out the same.

The numbers, per 3.5 oz (100 g)

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

How much is actually in it

• Of 18 packaged wonton soups in USDA's branded food data, all list wheat, 17 list soy, 13 shrimp, 12 sesame and 6 egg. Six list MSG, without saying how much. — packaged wonton soups sold in the US with a record in USDA Branded Foods (18 distinct GTINs, 2017-2026 labels) (n = 18 products) Evidence E source
  Wheat in 18 of 18; soy 17; shrimp 13; sesame 12; egg 6; monosodium glutamate 6 (no amount given); lactose 3
• Wonton dough is always wheat but not always egg. One US wrapper lists only wheat flour, gluten and additives, while the dough in two packaged soups lists egg yolk powder or egg. — wonton wrappers and wonton dough in three US branded products (n = 3 products) Evidence E source
  Wheat flour in all three; egg present in two (egg yolk powder, egg) and absent in one plain wrapper

What a real portion looks like

• One cup of wonton soup, 245 g, gives about 81 calories, 5.9 g protein and 907 mg sodium in US survey food data. — Soup, wonton (FNDDS 58408010) Evidence E source
  Per 100 g: energy 33 calories, protein 2.39 g, sodium 370 mg; per cup 245 g: 80.8 calories, 5.9 g protein, 906.5 mg sodium

What your body absorbs

• In a crossover RCT on 13 adults, 2 g of MSG added to a standard meal raised several plasma amino acids and gastric distension for about 2 hours, without changing glucose or insulin. — Healthy adults, 6 days of MSG or NaCl then a 700 calories liquid test meal (n = 13) Evidence B source
  Higher early postprandial leucine, isoleucine, valine and others; no change in glucose, insulin, GLP-1, ghrelin

What it does to your health

• In a crossover RCT on 60 normal-weight adults, eating a vegetable soup before lunch cut total meal energy intake by 20%, about 134 calories. — Normal-weight men and women, lab lunch once a week for 5 weeks (n = 60) Evidence B source
  Meal energy intake -20% (134 +/- 25 calories) with soup preload vs no preload; soup form made no difference
• In a crossover RCT on 32 lean men, low-energy broth preloads led to higher lunch intake than high-energy ones, but total daily energy intake did not differ. — Healthy lean males in Singapore, mean age 28.9 (n = 32) Evidence B source
  Ad libitum lunch higher after low energy density preloads (p = 0.012); daily energy intake no difference (p >= 0.214)
• A meta-analysis of cross-sectional studies linked soup consumption with 15% lower odds of obesity in 45,292 people. — Adults in 7 cross-sectional studies (n = 45292) Evidence C source
  OR 0.85 (95% CI 0.79-0.91) for obesity with soup consumption
• In an RCT on 58 young adults, a broth with 3.8 g of MSG daily for 4 weeks lowered desire for savory foods by 7.7 units versus a sodium-matched broth. — Healthy normal-weight young adults, 16 men and 42 women, 4 weeks (n = 58) Evidence B source
  Desire for savory foods -7.7 units (95% CI -13.7 to -1.7); savory intake -36 g (95% CI -91 to 19)
• A 2025 systematic review of 4 studies on 342 adults found that soup, mostly chicken-based, shortened acute respiratory infections by 1 to 2.5 days. — Adults with acute respiratory tract infections, 4 studies (n = 342) Evidence C source
  Illness duration shorter by 1-2.5 days; modest reductions in symptom severity

Safety, limits and interactions

• The FDA lists milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans and sesame as the nine major food allergens, and labels must name the food source of each one used. — US consumers with food allergy Evidence E source
  Nine major food allergens: milk, eggs, fish, Crustacean shellfish, tree nuts, peanuts, wheat, soybeans, sesame; labels must name the food source
• In a Japanese cohort of 42,535 adults followed for 14.4 years, the highest salt intake tertile had 1.67 times the hazard of oral, pharyngeal and esophageal cancers, and miso soup was the salt source linked to risk. — Japanese adults aged 40-79, JACC Study (n = 42535) Evidence C source
  HR 1.67 (95% CI 1.08-2.61) highest vs lowest salt tertile; 145 cases

What people believe that the data does not support

• A 1977 case report described a man with ventricular tachycardia 30 minutes after wonton soup and blamed monosodium glutamate. — One man aged 36 (n = 1) Evidence D source
  Ventricular tachycardia, converted with lidocaine; causal link to MSG assumed, not tested
• A systematic review of human MSG studies found no rise in headache in five of six studies where MSG was taken with food. — Human MSG challenge studies, 5 papers with food and 5 without Evidence C source
  With food: no significant headache difference except one female group; without food: 4 of 7 studies positive, poorly blinded
• A 2026 systematic review concluded that double-blind trials rarely confirm Chinese Restaurant Syndrome at realistic dietary MSG doses. — Clinical and mechanistic studies on MSG from 2019 onward plus earlier safety studies Evidence C source
  No consistent symptoms at dietary doses; IgE-mediated allergy exceedingly infrequent
• FDA says symptoms linked to MSG appeared in some sensitive people only at 3 g or more without food, while a typical serving with added MSG has under 0.5 g. — General US population; self-identified MSG-sensitive individuals Evidence E source
  Threshold for transient mild symptoms 3 g or more without food; typical serving under 0.5 g

Who this works differently for

• The 2025-2030 Dietary Guidelines for Americans set sodium below 2,300 mg a day from age 14, and below 1,200, 1,500 and 1,800 mg for children aged 1 to 3, 4 to 8 and 9 to 13. — US population aged 14 and above, and children by age band Evidence E source
  Sodium below 2,300 mg a day from age 14; below 1,200 mg at 1-3 years, 1,500 mg at 4-8, 1,800 mg at 9-13
• In the same 4-week MSG broth RCT, perceived umami taste fell by 8.4 units in women, a change reported for women only. — Women in a 58-person RCT of daily MSG broth (n = 42) Evidence B source
  Umami intensity -8.4 units on gLMS (95% CI -13.8 to -3.1) in women vs controls

What is still unknown

• The FDA says the allergen labeling law does not cover most restaurant or food service foods that are not pre-packaged with a label, so a bowl of restaurant wonton soup comes with no required allergen list. — people buying unpackaged food at restaurants or food service Evidence E source
  FALCPA does not cover most foods sold at retail or food service that are not pre-packaged with a label, or food wrapped after the order
• The only USDA reference record for restaurant wonton soup lists 406 mg sodium per 3.5 oz (100 g), and no sample spread is published for it. — Soup, wonton, Chinese restaurant (SR Legacy, FDC 171821) Evidence E source
  Sodium 406 mg per 3.5 oz (100 g); no Foundation Foods, CoFID or variability record to compare

The bottom line

A 1977 case report blamed MSG after a 36-year-old man developed palpitations and ventricular tachycardia 30 minutes after wonton soup. The cause was assumed and never tested. Controlled work since has mostly not found the effect. In a systematic review, five of six studies that gave MSG with food found no significant rise in headache, the exception being the women in one study, while many studies without food used high concentrations and poor blinding. A 2026 review concluded that double-blind trials rarely confirm Chinese Restaurant Syndrome at realistic dietary doses, in a narrative synthesis of mixed designs. The FDA puts the threshold for mild, short-lived symptoms in some sensitive people at 3 g or more of MSG taken without food, against under 0.5 g in a typical serving with added MSG. How much MSG a bowl of wonton soup holds is not known: six of the 18 packaged soups list MSG, none with an amount. At the doses tested, MSG changes a few measurable things. In 13 healthy adults, 2 g of MSG with a 700 calories liquid meal raised several blood amino acids and stomach distension for about 2 hours and left glucose and insulin unchanged. In 58 young adults, a vegetable broth with 3.8 g of MSG a day for 4 weeks lowered the desire for savory foods by 7.7 units (95% CI 1.7 to 13.7) against a sodium-matched broth. The drop in savory food actually eaten, 36 g, had an interval running from 91 g less to 19 g more. In the 42 women of that short trial, perceived umami taste fell by 8.4 units, a change reported for women only. Soup for a cold has soft support. A 2025 review of 4 small, mixed studies on 342 adults with acute respiratory infections, mostly using chicken soup, reported illness shorter by 1 to 2.5 days in a narrative synthesis. Across 7 cross-sectional studies of 45,292 adults, people who ate soup had 15% lower odds of obesity (OR 0.85, 95% CI 0.79 to 0.91). That is an association in odds, it cannot show cause, and it does not say which soups. The caution here is salt. In a Japanese cohort of 42,535 adults aged 40 to 79 followed for 14.4 years, the third with the highest salt intake had 1.67 times the hazard of mouth, throat and esophageal cancers (95% CI 1.08 to 2.61). Salt was estimated from a questionnaire, and miso soup was the salt source tied to risk. Miso soup is a different dish. The FDA threshold above is the only MSG safety figure on this page.

Sources

1. hf2-wtsp-1 · dataset
   Branded Foods 2026-04-30, 18 wonton soups after GTIN dedup, ingredient text contains: WHEAT 18 (all); SOY 17 (all but FDC 1458456); SHRIMP 13 (FDC 1458456, 1459270, 1859793, 1894601, 1895104, 1908808, 2090265, 2112445, 2129311, 2269420, 2511559, 2666826, 2674932); SESAME 12; EGG 6 (FDC 1458456, 1459270, 1908808, 2090265, 2269420, 2717560); MONOSODIUM GLUTAMATE 6 (FDC 1894601, 2090265, 2115765, 2150066, 2150303, 2717560); LACTOSE 3 (FDC 2115765, 2150066, 2150303)
   USDA FoodData Central, Branded Foods, full download release 2026-04-30 · checked 2026-10-08
2. hf2-wtsp-2 · dataset
   FDC 2412357 WONTON WRAPPERS (Frieda's): ENRICHED WHEAT FLOUR (...), WATER, GLUTEN, SALT, SODIUM PROPIONATE (...), SODIUM BENZOATE (...), CITRIC ACID, CALCIUM SULFATE, L-CYSTEINE (DOUGH CONDITIONER), TRICALCIUM PHOSPHATE. DUSTED WITH CORNSTARCH. || FDC 2090265 (Wei-Chuan) WRAPPER: WHEAT FLOUR (...), WATER, TAPIOCA STARCH, WHEAT GLUTEN, EGG YOLK POWDER, SALT, DOUGH CONDITIONER (DISTILLED MONOGLYCERIDES) || FDC 1908808 (S&P shrimp wonton soup): WONTON SKIN (WHEAT FLOUR, EGG)
   USDA FoodData Central, Branded Foods, full download release 2026-04-30 · checked 2026-10-08
3. wts-daily-r3-01 · portion data
   Soup, wonton (fdc_id 2709160): Energy 33 KCAL; Protein 2.39 G; Sodium, Na 370 MG per 100 g; 1 cup 245 g: Energy 80.8 KCAL, Protein 5.9 G, Sodium, Na 906.5 MG
   USDA FNDDS, FoodData Central survey foods, code 58408010 (fdc_id 2709160) · checked 2026-10-02
4. wts-daily-r3-06 · RCT
   This early postprandial phase was also associated with significantly increased levels of circulating leucine, isoleucine, valine, lysine, cysteine, alanine, tyrosine, and tryptophan after MSG compared with NaCl. No changes to the postprandial glucose, insulin, glucagon-like peptide (GLP)-1, and ghrelin were noted between MSG- and NaCl-supplemented meals.
   Am J Physiol Gastrointest Liver Physiol, 2011 · checked 2026-10-02
5. wts-daily-r3-03 · RCT
   When soup was consumed, subjects reduced meal energy intake by 20% (134+/-25 kcal; 561+/-105 kJ). The type of soup had no significant effect on test meal intake or total meal energy intake.
   Appetite, 2007 · checked 2026-10-02
6. wts-daily-r3-04 · RCT
   There was a significant difference in ad libitum lunch intake between treatments (p = 0.012), with higher intake in sweet LED and savoury LED compared to sweet HED and savoury HED. Energy intake at subsequent meals and total daily energy intake did not differ between the four treatments (both p ≥ 0.214).
   Nutrients, 2018 · checked 2026-10-02
7. wts-daily-r3-05 · meta-analysis of observational studies
   The meta-analysis of the studies of which outcome is odds ratio for obesity revealed that soup consumption is significantly related to lower odds ratio of obesity in combined data (n=45292, OR: 0.85, 95% CI: 0.79-0.91, p<0.0001)
   Physiol Behav, 2020 · checked 2026-10-02
8. wts-daily-r3-07 · RCT
   The desire for and intake of savory foods decreased after MSG treatment in both sexes with an ad libitum meal (desire: -7.7 units; 95% CI: -13.7, -1.7 units; P = 0.04; intake: -36 g; 95% CI: -91, 19 g; P = 0.04).
   J Nutr, 2018 · checked 2026-10-02
9. wts-daily-r3-14 · systematic review
   Findings showed modest reductions in symptom severity and illness duration (by 1-2.5 days).
   Nutrients, 2025 · checked 2026-10-02
10. hf2-wtsp-3 · agency advice
    The major food allergens are milk, eggs, fish, Crustacean shellfish, tree nuts, peanuts, wheat, soybeans, and sesame. ... The law requires that food labels identify the food source of all major food allergens used to make the food.
    US FDA, Food Allergies: What You Need to Know (content current as of 03/11/2026) · checked 2026-10-08
11. wts-daily-r3-13 · cohort
    the multivariable HR for the highest v. lowest tertiles of salt consumption was 1·67 (95 % CI: 1·08, 2·61, P-trend = 0·01).
    Br J Nutr, 2026 · checked 2026-10-02
12. wts-daily-r3-09 · case report
    A 36-year-old man developed severe weakness, palpitation, and diaphoresis 30 minutes after eating wonton soup.
    South Med J, 1977 · checked 2026-10-02
13. wts-daily-r3-10 · systematic review
    Of five papers including six studies with food, none showed a significant difference in the incidence of headache except for the female group in one study.
    J Headache Pain, 2016 · checked 2026-10-02
14. wts-daily-r3-11 · systematic review
    Findings indicate that anecdotal reports concerning Chinese Restaurant Syndrome (CRS) primarily draw upon uncontrolled research or subjective accounts, whereas double-blind, placebo-controlled investigations rarely confirm consistent symptomatology when realistic dietary doses are administered.
    J Am Nutr Assoc, 2026 · checked 2026-10-02
15. wts-daily-r3-12 · agency guidance
    The FASEB report identified some short-term, transient, and generally mild symptoms, such as headache, numbness, flushing, tingling, palpitations, and drowsiness that may occur in some sensitive individuals who consume 3 grams or more of MSG without food. However, a typical serving of a food with added MSG contains less than 0.5 grams of MSG.
    FDA, Questions and Answers on Monosodium glutamate (MSG), 2026 · checked 2026-10-02
16. hf2-wtsp-5 · dietary guideline
    The general population, ages 14 and above, should consume less than 2,300 mg per day of sodium. ... For children, the recommendations vary by age: - Ages 1–3: less than 1,200 mg per day - Ages 4–8: less than 1,500 mg per day - Ages 9–13: less than 1,800 mg per day
    Dietary Guidelines for Americans, 2025-2030 (HHS, USDA), January 2026 · checked 2026-10-08
17. wts-daily-r3-08 · RCT
    Relative to controls, increased consumption of MSG for 4 wk diminished umami taste in women (8.4 units on generalized Labeled Magnitude Scale; 95% CI: -13.8, -3.1 units; P = 0.013).
    J Nutr, 2018 · checked 2026-10-02
18. hf2-wtsp-4 · agency advice
    and most foods sold at retail or food service establishments that are not pre-packaged with a label. ... However, FALCPA's labeling requirements do not apply to foods that are placed in a wrapper or container (such as paper or a box for a sandwich) following a customer’s order at the point of purchase.
    US FDA, Food Allergies: What You Need to Know (content current as of 03/11/2026) · checked 2026-10-08
19. wts-daily-r3-02 · composition dataset
    Soup, wonton, Chinese restaurant (fdc_id 171821): Sodium, Na 406 MG per 100 g
    USDA SR Legacy, FoodData Central, fdc_id 171821 · checked 2026-10-02