NEVO data sources
Preferably, food composition data should come from chemical analyses by accredited laboratories. Other data sources include foreign food composition tables, scientific publications and food label information.
Missing values are filled in, if possible, by deriving the composition from the ingredients of the food, by borrowing values from similar foods or by logical deduction, e.g. 'vegetable product: vit D = 0'. Some nutrients and energy are calculated based on other nutrients with a formula, e.g. vegetable protein=total protein-animal protein.
For each value, a reference is known. You can see these for each food in the Product details screen, which you enter by clicking on the food name in NEVO-online. For every nutrient the reference is shown.
The references and reference id's are available in the download.
Reference codes are different from NEVO online editions until 2016, because of a different software system. A translation table from elderly reference codes to the present codes is available.