Reading Food Labels (for Parents) - Nemours KidsHealth Percent daily value is most useful for seeing whether a food is high or low in nutrients: A food with 5% or less of a nutrient is low in that nutrient. A food with 10%-19% of a nutrient is a good source of that nutrient. A food with 20% or more of a nutrient is high in that nutrient. The information on food labels is based on an average diet ...