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Related Experiment Video

Updated: Jun 6, 2026

'Boden Food Plate': Novel Interactive Web-based Method for the Assessment of Dietary Intake

'Boden Food Plate': Novel Interactive Web-based Method for the Assessment of Dietary Intake

Published on: September 18, 2018

Sampling variability and uncertainty in total diet studies.

Yoshiki Tsukakoshi¹

¹National Food Research Institute, 2-1-12 Kannondai, Tsukuba, Ibaraki, Japan. yoshiki.tsukakoshi@gmail.com

|December 2, 2010

Summary

Understanding food sampling uncertainty is crucial for total diet studies (TDS). This study found intra-city variance often exceeds inter-city variance, highlighting the importance of sampling design for accurate cadmium concentration analysis.

Related Experiment Videos

Last Updated: Jun 6, 2026

'Boden Food Plate': Novel Interactive Web-based Method for the Assessment of Dietary Intake

'Boden Food Plate': Novel Interactive Web-based Method for the Assessment of Dietary Intake

Published on: September 18, 2018

Area of Science:

Food safety and nutrition
Environmental chemistry
Statistical analysis in research

Background:

Total diet studies (TDS) are essential for assessing dietary exposure to contaminants.
Quantifying uncertainty in TDS is critical for accurate risk assessment.
Previous TDS have not fully assessed the uncertainty associated with sampling designs.

Purpose of the Study:

To clarify the uncertainty budget in a total diet study (TDS) by dissecting measurement uncertainty.
To differentiate between inter-city variance, intra-city variance, and analytical variance in food samples.
To evaluate the impact of sampling design, specifically multi-stage sampling, on TDS uncertainty.

Main Methods:

Collected TDS samples from 14 cities across Japan.
Prepared duplicate food samples from various shops within each city.
Measured cadmium concentrations individually to determine intra-city variance and analytical variance.

Main Results:

Intra-city variance was consistently higher than inter-city variance across all food groups studied.
Cadmium concentrations showed an intra-city correlation, indicating effective sample size is complex.
High intra-city variance was particularly noted for bean and potato food groups.

Conclusions:

Sampling design significantly impacts the uncertainty budget of total diet studies.
Grouping food samples from different shops within the same city enhances result representativeness.
Accurate assessment of sampling and analytical uncertainties is vital for robust TDS findings.