These fats are liquid at room temperature and found mainly in fatty fish, nuts, seeds and oils from plants. Examples of foods that contain these fats include salmon, trout, herring, avocados, olives, walnuts and liquid vegetable oils such as soybean, corn, safflower, canola, olive and sunflower. Fat adds flavor and taste to foods and gives you satiety value. 2  Fats are an important source of calories and nutrients especially for infants and toddlers. 3  Fats are known as triglycerides, both in food and in the body and they are the storage and transport form of fats.