missing entries from USDA database

It seems there are common items missing from the USDA nutrient database. For example, "Spinach, raw" and "Pepper, sweet, red, raw" are missing. So far I've been find what I'm looking for in the NCCDB or I can always make a custom food if what I'm looking for is unavailable in the provided databases, but why would what is arguably the most "official" database, the USDA Nutrient DB, be incomplete? Are items still being added to it?

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