USDA SR Database vs FNDDS Database

What is the difference between the USDA SR & the FNDDS Database?

Both the USDA & the FNDDS databases are provided by the USDA.  

The USDA SR (Standard Reference) database provides single ingredients, whole foods, some brand name items, & some prepared dishes.  
The FNDDS (Food & Nutrition Database for Dietary Studies) includes whole foods, some brand name items, & additional prepared dishes that you may not find in the USDA SR database.  
The USDA SR database is used to provide the analyses of the FNDDS database foods, so both use the same data sets.  There will be some duplicates, but the databases also compliment each other.
The USDA SR database reports over 100 nutrient fields (however data is not populated for all foods - some missing data).
The FNDDS database reports about 60 nutrients (with the majority of these fields populated - very few missing data).

Some general rules of thumb are, find the closest match to the food you need.  If you see duplicates, use the USDA SR option first.

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