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Project for someone: provide better sorting, ranking, visualization etc. for food nutrition info. You sometimes see these, not all of them are well done.

OP mentions use of the USDA National Nutrient Database. Here is where you can get a download, plus previous versions and updates from previous versions if you plan to maintain your own database copy over time: http://www.ars.usda.gov/Services/docs.htm?docid=8964

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That's a really interesting idea. A potential problem is finding a similar, standardized source of food price data (if you want to include that). Some data are published by the USDA ERS [1], but it's far from comprehensive.

[1] e.g. http://www.ers.usda.gov/data-products/quarterly-food-at-home...

How about this? http://bl.ocks.org/syntagmatic/raw/5023284/

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