Is McDonald's Filet-O-Fish High in Histamine?

McDonald's Filet-O-Fish

High histamine

The Filet-O-Fish is high in histamine, mostly from the tartar sauce with the processed cheese adding to it.

Fast food is cooked in batches and held warm rather than made when you order it, so it is rarely as fresh as something cooked at home. That matters here because histamine builds up as protein foods sit, which means the same item can affect you differently depending on how long it waited.

Gluten Dairy

This sandwich is a breaded pollock fillet with tartar sauce and a slice of American cheese on a bun.

Tartar sauce — this is the main driver and it is high, so it pushes the whole sandwich up on its own.
Processed American cheese — this runs moderate, so even setting the sauce aside there is a second ingredient nudging things higher, while the pollock and the fresh bun are milder.

Dropping the two condiment-style toppings gets you much closer to a lower-histamine bite.

This rating comes from McDonald's own published ingredient statement, read on August 10, 2026. Restaurant recipes vary by location and change over time, so always check the current listing: source 1, source 2. How we rate foods →

McDonald's Filet-O-Fish and McDonald's 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.