Comment by devinhelton

On their ingredients page ( https://www.mcdonalds.com/us/en-us/product/hamburger.html ) it says that the patty consists of:

"100% Beef Patty. Ingredients: 100% Pure USDA Inspected Beef; No Fillers, No Extenders. Prepared with Grill Seasoning (Salt, Black Pepper)."

That seems pretty clear to me. USDA defines beef as flesh of cattle. If there is anything but "flesh of cattle" in the patty, McDonald's is committing fraud.