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. 2020 Nov 1;78(11):885-900.
doi: 10.1093/nutrit/nuz107.

Portion size estimation in dietary assessment: a systematic review of existing tools, their strengths and limitations

Birdem Amoutzopoulos  1   2 , Polly Page  1   2 , Caireen Roberts  1   2 , Mark Roe  3 , Janet Cade  4 , Toni Steer  1   2 , Ruby Baker  1 , Tabitha Hawes  1 , Catherine Galloway  1 , Dove Yu  1 , Eva Almiron-Roig  5
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Free article

Portion size estimation in dietary assessment: a systematic review of existing tools, their strengths and limitations

Birdem Amoutzopoulos et al. Nutr Rev. .
Free article

Abstract

Context: Overestimation or underestimation of portion size leads to measurement error during dietary assessment.

Objective: To identify portion size estimation elements (PSEEs) and evaluate their relative efficacy in relation to dietary assessment, and assess the quality of studies validating PSEEs.

Data selection and extraction: Electronic databases, internet sites, and cross-references of published records were searched, generating 16 801 initial records, from which 334 records were reviewed and 542 PSEEs were identified, comprising 5% 1-dimensional tools (eg, food guides), 46% 2-dimensional tools (eg, photographic atlases), and 49% 3-dimensional tools (eg, household utensils). Out of 334 studies, 21 validated a PSEE (compared PSEE to actual food amounts) and 13 compared PSEEs with other PSEEs.

Conclusion: Quality assessment showed that only a few validation studies were of high quality. According to the findings of validation and comparison studies, food image-based PSEEs were more accurate than food models and household utensils. Key factors to consider when selecting a PSEE include efficiency of the PSEE and its applicability to targeted settings and populations.

Keywords: comparison; dietary assessment; portion size estimation aids; portion size tools; validation.

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