Saturated fats can raise both bad and good cholesterol levels and increase the risk of heart disease and stroke. Sources of saturated fats include meat, dairy, tropical oils, and processed foods made with partially hydrogenated oils. Unsaturated fats can lower bad cholesterol and risk of heart disease, and provide essential fats, with sources including nuts, seeds, fatty fish, and plant-based oils. The American Heart Association recommends limiting saturated fat intake and keeping trans fat intake as low as possible while including unsaturated fats.