Validation of a method for the estimation of food portion size

Fabrizio Faggiano, Paolo Vineis, Daniela Cravanzola, Paola Pisani, Graziella Xompero, Elio Riboli, Rudolf Kaaks

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

In the context of the planning phase of a large cohort study on dietary habits and cancer, we have developed a food frequency questionnaire on usual food intake, which includes a set of pictures to estimate the portion size of 23 different dishes. The validity of the estimation of portion size of recently consumed foods has been questioned by other researchers. To validate the use of pictures, we organized a field trial with 103 volunteers. They were invited to a dinner where standard Italian dishes were offered (total 17 foods); all of the portions they chose were recorded and weighed. The following day, we interviewed the volunteers on what they consumed during the dinner, and we compared the weight of the food actually eaten with the weight of the food represented in the pictures. The volunteers overestimated the portion size by more than 20% for six foods and underestimated the portion size by more than 20% for four foods. In addition, we found a tendency toward overestimation of portion size by those who ate smaller portions and underestimation by those who ate larger portions (“flat slope syndrome”).

Lingua originaleInglese
pagine (da-a)379-382
Numero di pagine4
RivistaEpidemiology
Volume3
Numero di pubblicazione4
DOI
Stato di pubblicazionePubblicato - 1 lug 1992
Pubblicato esternamente

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