Frugal Fitness Answer:
The FDA only requires some of the basic nutrients to be included on food labels so some labels have only the minimum requirements. This is often due to limited space on the food label. A prime example of this is peanut butter. Many companies just put a couple of micronutrients on the label and do not include all of the B-Vitamins, Vitamin E, or mineral content found in peanuts. If you weren’t an expert on foods, how would you know that it contained these nutrients? Not every company, product, or consumer cares about how much Vitamin E or Riboflavin there is in a product, or the ratio of polyunsaturated fats to monounsaturated fats. I personally like to see as much nutritional information on a food product as possible to know what I am putting into my body.