I found a compact set of official USDA and USDA-linked sources centered on FoodData Central, with one group for the main user-facing nutrient lookup and one group for downloadable dataset records that are more useful for research and data access. The ARS overview and USDA catalog entries are the best starting points for meal planning, nutrition lookup, and deeper research use[1][2][3].
Start here for the primary searchable database and USDA explanation of how it is used for nutrient lookup and food-composition work.
These official records point to FoodData Central component datasets and related USDA food-composition resources that are useful when you need downloads, legacy coverage, or research context.
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