"The Development of an Index of Food Quality" by Ann Woolley Sorenson
The purpose of this study was to develop a food quality index that can provide practical information to both consumers and professional people. The Index of Food Quality (IFQ) is a simple computerized tool based on a concept of nutrient density. The IFQ was designed to organize and clarify the present body of food composition data into a form that is directly applicable to dietary problems. The IFQ provides a method of analyzing food quality based on energy needs. The nutrient contents of foods are compared to essential nutrient standards with calories as a common denominator. In developing the IFQ, the nutrient standards were usually derived from the FDA's recommended Daily Allowances (USRDA), and the value of 2300 kcal represented an average adult requirement for energy. An index number of "1" for a particular nutrient in a given food indicates that the amount of that food yielding just sufficient energy per day to maintain weight and good health will also contain exactly the recommended daily allowance of that nutrient. We developed an index number for each nutrient in each food considered in this study. A profile of index numbers was then derived for each food. One can assess whether he is meeting the RDA by calculating whether the foods he eats additively give a value of one or greater for each nutrient area. A computer program was developed that computes the nutrient indices and prints them in tabular and bar graph forms. The program is written in FORTRAN and was developed for use with a Burroughs B6700 digital computer, but is readily compatible with the IBM 360/40 system as well. The program can evaluate a single food, various foods, and combinations of foods (i.e., diets, menus, or recipes) by printing its (their) nutrient profile. The graphs reflect the nutrient quality of a food, whether it is used as a sole source of energy or as it usually contributes to the diet (serving size). Menus, recipes, and diet profiles are presented as the sum of the nutrient contents of their individual foods and are printed as composite graphs. Nutrient data is being stored on tape and on disk. As it becomes available, new data may be written out on the disk file for later intra or inter-program use, either adding to or updating old values in the library. The IFQ program is completely flexible because every parameter can be expanded and/or