Congestive heart failure (CHF) is a common problem in which the heart cannot function as it should. It can be caused by blockages in the blood supply to the heart (coronary artery disease), and it is the leading reason for hospitalization in people older than 65 years. Fatty acids are found in oils and other fats in our diets. Although some fatty acids (for example, omega-3 fatty acids) might be helpful in preventing coronary artery disease, less is known about their effect on CHF.