NutritionData.com The data in ND's database comes from the USDA's National Nutrient Database for Standard Reference (release 17), and is supplemented by additional listings provided by restaurants and food manufacturers. The exact source for each individual food item is listed in the footnotes of that food's analysis page. Opinions expressed on the analysis page are based on calculations derived from the Daily Reference Values (DRVs), Reference Daily Intakes (RDIs), and recommendations of the FDA. While ND cannot guarantee the absolute accuracy of every listing, we make every attempt possible to insure the quality of our data.