23 Aug 2018 --- Nutrition experts have set out to determine if the 2015 update of the Healthy Eating Index (HEI), a measure of diet quality that is updated to reflect the Dietary Guidelines for Americans (DGA), can be used to determine the overall quality of the American diet adequately. The researchers found that this quality can also be defined, using the HEI, at different levels such as the national food supply, the community food environment and food intakes among population subgroups.