Reddit users who claim to be McDonald’s past and present employees have revealed the menu item you should never order from the fast food restaurant and why.

The fast food chain is a favorite for millions, but these claims may end up leaving a bad taste.

In a thread where restaurant workers were asked to share which menu items people should never order, users who claimed to work for the chain agreed that the Filet-O-Fish was a poor choice.

A Reddit user who said he used to work at McDonald’s three years ago said: “I can promise you that filet of fish is not fresh by any stretch of the imagination.”

“At McDonald’s just say you want a fish filet cooked to order,” another user advised.

He then explained that you would have to wait five minutes longer for your order but it will be “worth it compared to the filet that has been in the heated cabinet for hours.”

Despite the criticism, one loyal McDonald’s customer defended the chain by saying the fish burger is his favorite dish on the menu.

He said: “If you’re going to serve me a square piece of fish that tastes the exact same whether I order it in Denver or the south of France, I am under no assumption that it is by any means fresh.

“And I am completely okay with that, it’s my go-to comfort food.”

The Sun Online has contacted McDonald’s for further comment.

This article originally appeared on The Sun.