Final answer:
Common oil-based foods include cottonseed, olive, and sunflower oils. These should be chosen over solid fats for health benefits but consumed in moderation.
Step-by-step explanation:
Oil-based foods primarily include vegetable oils that are liquid at room temperature. These are high in unsaturated fatty acids, which are considered healthier fats. Some common oil-based foods are cottonseed oil, olive oil, and sunflower oil.
Besides these, other oils like salmon oil and avocado oil are also oil-based. Such oils can be used in various food preparations, such as salad dressings, cooking, and baking. It's important to choose plant-based liquid oils over solid animal fats for health benefits, though oils should be consumed in moderation due to their high caloric content.