american journal of epidemiology vol 154 no 12 copyright 2001 by the johns hopkins university bloomberg school of public health printed in u s a all rights reserved a further ...
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...American journal of epidemiology vol no copyright by the johns hopkins university bloomberg school public health printed in u s a all rights reserved further look at food frequency questionnaires willett invited commentary dietary questionnaire validation walter knowledge about long term consequences diet is clear reasons exist to focus on energy adjusted nutrient downloaded from https academic oup com aje article guest january centrally dependent methods used measure intakes which specifically composi intake foods individual participants epidemiologic tion diets evaluations validity studies avoid recall and selection biases occur most fundamental reason that central aim observa many case control investigations large scale tional predict what would happen dis prospective are highly desirable this context self ease risk were exposure administered usually practical neces change changes must be made primarily sity several different altering composition with total have been developed becau...