When cooking with unhealthy ingredients, there are many substitutions you can use to make your recipes healthier. For example, you can substitute full-fat dairy products for low-fat or non-fat options, or use applesauce or mashed banana instead of butter or margarine. You can also use whole wheat flour instead of white flour, and replace sugar with natural sweeteners like honey or maple syrup. Additionally, you can use olive oil or avocado oil instead of butter or vegetable oil.