Our ModelEarth team is building nutrition profiles from YAML and json for balanced meals using the USDA API.
Data.World Food Nutrition Data
Data for raw fruits and vegetables is used here in the balance repo created by Rakesh.
USDA Food Database
Four categories of foods are updated every quarter. (Also used in the balance repo.) Let's use the API in real-time too.
Google Data Commons
Find nutritional profile data including minerals (calcium, sodium, zinc etc).