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Firehouse Subs Chicken Noodle Soup

High histamine

This chicken noodle soup runs high, mostly from the long-simmered chicken stock plus yeast extract and soy protein concentrate.

Food here is usually assembled to order from components that were prepped earlier in the day, so it tends to be fresher than a drive-through and less fresh than cooking at home. Histamine builds up as protein foods sit, so how long the chicken or beef has been in the warmer matters as much as what is in the bowl. Treat the rating above as a starting point.

Gluten Histamine Liberator

A comforting mix of chicken stock, egg noodles, chicken meat, carrots, celery, and onions, but a few savory ingredients push it up.

  • Chicken stock leads it — stocks that are simmered and held for a long time tend to run high in histamine, and this soup is built on one.

  • Savory boosters add to it — the yeast extract and soy protein concentrate that deepen the flavor are both high, so the broth carries most of the weight while the noodles and vegetables are milder.

There isn't a clean way to order this one lower, so a fresh, non-broth item is the safer pick.

What's in it

This is a restaurant menu item, so its rating comes from its ingredients. Here is what it is typically made of and where the histamine sits. Tap any whole food for the full detail.

This rating comes from Firehouse Subs' own published ingredient statement, read on August 11, 2026. Restaurant recipes vary by location and change over time, so always check the current listing: source 1, source 2. How we rate foods →

Firehouse Subs Chicken Noodle Soup and Firehouse Subs are trademarks of their respective owners. This page is an independent histamine reference and is not affiliated with, endorsed by, or sponsored by the brand.

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Foods With High Histamine Levels Why Freshness Matters More Than Food Lists Why Leftovers Can Trigger Histamine Symptoms What Are Histamine Liberators?

For educational purposes only. Not medical advice. Consult a healthcare professional for personal guidance.

References

  1. SIGHI Food Compatibility List — SIGHI (2026)
  2. Histamine and histamine intolerance — Maintz & Novak (2007)
  3. Histamine Intolerance: The Current State of the Art — Comas-Basté et al. (2020)
  4. Low-Histamine Diets: Is the Exclusion of Foods Justified by Their Histamine Content? — Sánchez-Pérez et al. (2021)
  5. Histamine Intolerance: Symptoms, Diagnosis, and Beyond — Jochum (2024)
  6. Guideline on management of suspected adverse reactions to ingested histamine — Reese et al. (2021)