WolframAlpha can combine nutrition information for a series of items, to generate an aggregate "Nutrition Facts" label. Ex.: http://www.wolframalpha.com/input/

WolframAlpha can combine nutrition information for a series of items, to generate an aggregate "Nutrition Facts" label. Ex.: http://www.wolframalpha.com/input/?i=1%20slice%20pizza%20%2b%201%20Apple%20%2b%2050g%20spinach%20%2b%201%20cup%20milk http://www.wolframalpha.com/input/?i=1%20slice%20pizza%20%2b... Years ago I applied for API access with the intent of making an app for diet tracking, but was denied. (And from what I've heard, queries would have been prohibitively expensive.)