27 August 2012
Environmental Working Group’s “Good Food on a Tight Budget” project aims to help people with modest food budgets find the healthiest foods.
This analysis is the first comprehensive food-ranking system that considers nutrition, affordability and common contaminants that arise from environmental pollution, processing and packaging.
We have systematically reviewed thousands of foods using a wide range of information compiled from the peer-reviewed literature and from food testing and price surveys conducted by U.S. Department of Agriculture. We rate foods based on a balance of five factors:
1. Beneficial nutrients
2. Nutrients to minimize (e.g., sodium)
4. Extent of processing
5. Harmful contaminants from environmental pollution and food packaging
It's all here and here.