Is Firehouse Subs Bacon High in Histamine?

Firehouse Subs Bacon

High histamine

This bacon topping is high in histamine because it is cured and smoked with sodium nitrite.

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.

This is a classic cured, smoked bacon added as a sub topping.

Cured and smoked pork — bacon is cured with salt and smoke flavoring, and curing is exactly the kind of aging process that lets histamine build up, which puts it in the high range.
Sodium nitrite — the curing agent that goes with it also reads high here, reinforcing the same verdict.

If you want a lower-histamine build, a sub topped with fresh vegetables rather than cured meat is the better path.

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 Bacon 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.