Hello, I'm an expert in the field of vegan diets and fast food options. When it comes to fast food fries, it's important to note that not all fries are vegan due to the presence of animal-derived ingredients or the fact that they may be cooked in the same oil as non-vegan products. However, some fast food chains do offer vegan options or have fries that are considered vegan.

McDonald's: McDonald's fries in the UK and Ireland are vegan, as they are cooked in a separate vegetable oil. However, this can vary by location, so it's always best to check with the specific restaurant.

Burger King: Their fries are vegan in the UK, but in the US, they are cooked in the same oil as their chicken fries, which makes them not suitable for vegans.

KFC: KFC's fries are not vegan because they are cooked in animal fat.

Taco Bell: Taco Bell's fries are vegan, and they also offer a vegetarian version of their power menu items.

Wendy's: Wendy's natural-cut fries are vegan, but their seasoned fries contain a beef flavor.

Five Guys: Five Guys' fries are cooked in peanut oil, which is generally considered vegan, but they do serve peanut sauce which contains dairy, so there might be cross-contamination.

It's always a good idea to ask the restaurant directly about their preparation methods and ingredients to ensure the fries are vegan.

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