Is Firehouse Subs Loaded Baked Potato Soup High in Histamine?

Firehouse Subs Loaded Baked Potato Soup

High histamine

This soup is high in histamine, driven by the cheddar, sour cream, bacon, and chicken broth.

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.

Dairy

This is a creamy potato soup built on chicken broth with cheddar, sour cream, bacon, and processed cheese, and several of those run high.

Aged and cured pieces lead — the cheddar cheese is aged, the sour cream is cultured, and the bacon is cured, so each carries histamine on its own. The yeast extract is high too.
The broth adds to it — long-simmered chicken broth tends to run high, and the processed cheese food sits at moderate, so the base itself is not a clean starting point.

The potatoes and cream are milder, but the toppings and broth set the level here.

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 Loaded Baked Potato 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.