The healthiest type of fat for the body is unsaturated fat, which includes both monounsaturated and polyunsaturated fats. Sources of unsaturated fats include avocados, nuts, seeds, and olive oil. These fats are beneficial as they can help lower LDL cholesterol levels and reduce the risk of heart disease. In contrast, saturated and trans fats can raise LDL levels and contribute to cardiovascular problems. Incorporating more unsaturated fats into the diet while limiting harmful fats can promote overall health and well-being.