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Percent daily value is the nutrient amount per serving as a percentage of the reference daily value, based on a 2000 kcal diet. The 5% and 20% thresholds are the conventional interpretation guides: 5% or less is a low source and 20% or more a high source of that nutrient.
Percent daily value
%DV = nutrient per serving x 100 / reference daily value
Reference daily values and their presentation are prescribed by labelling regulation and differ between jurisdictions.
No. They are single reference figures for labelling, derived from population recommendations but not tailored to age, sex or activity. Individual requirements vary considerably.
It is a rounded average reference intake for labelling purposes. Panels usually carry a footnote making clear that individual needs may be higher or lower.