Dietary patterns and trends in the United States: The UNC-CH approach

Over the past 2 decades our group of nutrition and economics researchers at the University of North Carolina at Chapel Hill has used a wide array of m ethods to study eating patterns and dietary trends. Our focus has been on c haracterising the way diet has changed over time and identifying some of th e major factors underlying these trends. The complexity of this undertaking has led us to develop a number of unique systems for classifying foods and assessing the overall quality of diet. We have also addressed the challeng es that exist when measuring changes in both the food supply and food-relat ed behaviors over time. This paper summarises some of the methodological wo rk related to food grouping, overall diet quality indices, and trends resea rch as well as the challenges we still face in this arena. (C) 1999 Academi c Press.