NUTR SCI 332 Lecture Notes - Lecture 9: Questionnaire, Recall Bias, Confounding
1/22 – Nutrition studies and dietary reference intakes
Key challenges in human nutrition research
• Measurements of exposure and outcomes
o Food intakes: people change their diet over time, hard to track
long-term
o Confounding factors: diet interacts with genetics and lifestyle
o Disease indexes: take decades to develop
• Challenging to measure habitual intake:
o 24-hour recall
▪ food and drink recorded for 24 hours
▪ may not represent usual intake
▪ recall bias
▪ dietitian/professional interviews subject
o food frequency questionnaire
▪ asks ho ofte do you eat/dik _____?
▪ a little better than 24-hour recall, still not great
▪ analyzes food intake patterns
▪ limited in accuracy and completeness
o food record (food diary)
▪ recorded immediately when person consumes food
▪ portion sizes estimated
▪ most accurate method of dietary assessment
▪ may not be representative of normal intake
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