Final answer:
Foods high in polyunsaturated fats include soybean and corn oils, fish, flaxseed, and nuts like walnuts and pecans. Foods contain a mix of fat types, but are often categorized by the predominant type.
Step-by-step explanation:
The food that has the greatest amount of polyunsaturated fat often includes various plant oils like soybean and corn oil, as well as fish, flaxseed, and certain nuts such as walnuts and pecans. Other sources include safflower oil and foods rich in omega fats, which are essential types of polyunsaturated fats.
It's important to recognize that while a specific oil or food might be categorized by the predominant type of fatty acid it contains, such as monounsaturated or polyunsaturated, most foods contain a mixture of saturated, monounsaturated, and polyunsaturated fats.