HLTH355 Lecture Notes - Lecture 84: Questionnaire, Food Fortification, Serving Size

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Brief instruments (screeners: similar to a food frequency questionnaire but focused on particular dietary factors, e. g. fruits and vegetables. Picture of questionnaire: questions are answered on a scale. Limited aspects of diet: aim to assess usual intake, require tailoring, fast, rely on long-term memory. Errors in ffqs and brief instruments: affected by systematic error or bias, contributors: Databases: often incomplete and out of date. Canadian nutrient file based on us data with modifications for food fortification, addition of. Picture: three plates with the same food in them but each successively larger than the previous. Portion size aids: picture of plate, picture of measuring cups and spoons. Summary: no self-report instrument is error free, generally biased toward underestimation of energy intake but provide useful information on dietary behaviours and patterns, food frequency questionnaires and brief instruments affected to a greater extent by systematic error or bias. Slide 40: food frequency questionnaire, systemic error.

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