What is the ONQI? 
The Overall Nutritional Quality Index (ONQI) is
an algorithm designed to generate a single, summative
score for the “overall nutritional quality” of a food based
on its micronutrient and macronutrient composition and
several other of its nutritional properties (e.g., energy
density). The ONQI is further designed to stratify foods
into a rank order of relative nutritiousness both
universally (i.e., across all food categories) and within
specific food categories (e.g., breads, cereals, frozen
desserts, etc.), while avoiding the characterization of any
food as “good” or “bad” in absolute terms.
The ONQI enables the “average shopper” to choose foods on the basis of overall nutritional
quality with the ease and fidelity of top nutrition experts.
It is designed to have applications at point
of purchase in retail supermarkets, on food packaging, in restaurants, in
print materials (e.g., books, periodicals), and on-line.
Griffin Hospital news release
Topco news release (PDF)