According to The American Heart Association, peanut oil "contains more better-for-you fats and less saturated fat." Also, "peanut oil stays liquid at room temperature, and is healthier than solid fats (like butter, shortening, lard and hard stick margarine). According to The Food Lover's Companion food dictionary, peanut oil is about 50 percent monounsaturated fats and 30 percent polyunsaturated fats. Peanut oil contains a small amount of vitamin E and is rich in omega-6 fatty acids.