Nutritional accuracy is very important when tracking macronutrients. If you plan to eat a variety of foods, throw in some treats from time to time, and still come close to your macro goals every day, you’d better know exactly what you’re eating. Nutritional labels are usually close but are not 100 percent accurate, and there’s no way to really know what you’re getting. It’s fine to eat foods out of packages, but then you’re also getting a whole lot of other added, unnecessary ingredients.