Dietary Data in the Malmö Offspring Study-Reproducibility, Method Comparison and Validation against Objective...

Area of Science:

• Nutritional Epidemiology
• Dietary Assessment Methods
• Biomarker Validation

Background:

• Accurate dietary intake estimation is crucial for nutritional research.
• Irregular dietary patterns pose challenges for traditional food record methods.
• Objective biomarkers and combined dietary assessment approaches can enhance data validity.

Purpose of the Study:

• To evaluate the reproducibility of two dietary assessment methods: a 4-day food record (4DFR) and a short food frequency questionnaire (SFFQ).
• To compare the intakes estimated by 4DFR and SFFQ.
• To validate dietary intakes of specific food groups (fatty fish, fruits and vegetables, citrus) against objective plasma biomarkers.

Main Methods:

• The study utilized data from the Malmö Offspring Study (n=1601).
• Reproducibility was assessed through repeated dietary intake measurements (n=180).
• Intake estimates from 4DFR and SFFQ were compared, and correlations with plasma biomarkers (CMPF, β-carotene, proline betaine) were analyzed. Principal component analysis (PCA) was used to combine method estimates.

Main Results:

• SFFQ demonstrated superior reproducibility compared to 4DFR, particularly for infrequently consumed foods.
• Between-method correlations were moderate (median ρ = 0.33), higher for general food groups than specific items.
• Biomarker correlations were strongest for citrus (proline betaine, ρ = 0.53) and fruits/vegetables (β-carotene, ρ = 0.39) using PCA scores. SFFQ showed the highest correlation for fatty fish intake with CMPF (ρ = 0.46).

Conclusions:

• SFFQ is a more reproducible dietary assessment tool than 4DFR for capturing irregular food consumption patterns.
• Combining dietary assessment methods offers marginal improvements for fruit and vegetable intake estimation.
• SFFQ data provides the most valid assessment of fatty fish consumption in this cohort.