Unsaturated fats, particularly those found in sources like olive oil, avocados, and fatty fish, are considered the healthiest type of fat in a diet. They can improve heart health by lowering bad cholesterol levels and providing essential fatty acids, which the body cannot produce. These fats also contribute to overall health by supporting brain function and reducing inflammation. Including them in a balanced diet can deliver numerous health benefits while maintaining overall nutritional balance, making them preferable over saturated and trans fats.