Why are seed oils so common in fast food?
Seed oils like soybean, canola, and corn oil are cheap, shelf-stable, and possess high smoke points, making them ideal for the intense demands of commercial deep fryers.
They are also neutral in flavor, which is why they serve as the base for almost every creamy sauce, mayonnaise, and salad dressing at fast food chains.
How to avoid seed oils when dining out
The fryer is almost always off-limits. Most major chains use a blend of canola, soybean, or corn oil for fries, chicken nuggets, and breaded items.
Sauces are a hidden source. Creamy sauces and dressings are typically emulsified with soybean or canola oil. Opt for mustard, hot sauce, or dry rubs.
Look for chains that use beef tallow, olive oil, or coconut oil, though these are increasingly rare in mainstream fast food.
Check the data for specific restaurants
We audit the public ingredient lists of major fast food chains to map exactly which menu items contain seed oils.
You can use the links below to see our deep-dive audits for popular restaurants and find the safest menu items.
Frequently Asked Questions
Yes, McDonald's uses a canola-blend oil for frying and their sauces commonly contain soybean oil.
It is extremely rare for a national chain to be 100% seed oil free. However, specific menu items (like plain grilled proteins or side salads without dressing) can often be ordered seed oil free.