Fats and oils play an important role in today's modern diet. Consumed in modest quantities, these foods can be important to skin and nail growth, joint health, and bone structure. These foods contain carbohydrates, protein, and B-complex vitamins. Examples of fats and oils include salad dressing, margarine, cooking oil, shortening, and flaxseed oil. Producers of these foods include Crisco, Blue Bonnet, and Smart Balance.