Portion size of food and drink products is an important factor when providing nutrition information for food labeling purposes. The present study was conducted in order to understand more about consumer attitudes and understanding of portion size information on food and drink products. An experimental trial was performed on mothers and one of their relative. The participants were asked to prepare two meals (one meant for a child, one for an adult), with ingredients measured only with kitchen tools. Participants were stratified by portion size information in two groups, one with labels bearing the “100 gram” and one with “per portion”. Subsequently, every participant was interviewed on the basis of a questionnaire assessing nutritional and portioning knowledge. When measured the total Kcal of prepared meals after the simulation, an increase of calories was recorded in the group of subjects who prepared foods bearing the100g label, although not statistically significant(p =0.842). Portion size use seemed to be a more intuitive way to properly share nutritional information on food label, especially when considering common traditional recipes. Meals responsible appeared to be much more at ease with per portion labeling, when preparing both children's meals and adult ones.
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