Is Firehouse Subs White Bread High in Histamine?

Firehouse Subs White Bread

High histamine

This white bread reads high, driven mainly by the soy oil plus the wheat and barley flours and yeast.

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

The rating comes from the mix of oil, flour, and yeast rather than any one cured item.

Soy oil — the soybean oil in the recipe is the high driver here, pushing the loaf up on its own.
Flour and yeast — the enriched wheat flour, malted barley flour, and yeast each land moderate, so the leavened, flour-based build adds to the picture.

A plainer, unleavened wrap or a simpler fresh bread is the more comfortable base if you want to keep things lower.

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 White Bread 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.