Polyunsaturated fats are a type of dietary fat that are beneficial for heart health. They are found in foods like fish, nuts, seeds, and vegetable oils such as canola and sunflower oil. These fats are liquid at room temperature and can help lower bad cholesterol levels when consumed in moderation. There are two main types of polyunsaturated fats: omega-3 and omega-6 fatty acids. Omega-3 fatty acids are particularly important for brain function and can be found in fatty fish like salmon and mackerel. Omega-6 fatty acids are also essential but should be balanced with omega-3s for optimal health.