Comparison of Different Methods for Estimating Food Portion Size

Considering Gender Differences in Portion Sizes to Improve the Accuracy of Nutrient Intakes from A Food Frequency Questionnaire

The aim of this study was to examine whether using gender specific-portion size (GS-PS) improves the accuracy of nutrient intake assessment by a quantitative food frequency questionnaire (QFFQ). For GS-PS quantification, a gram amount was assigned to each PS category for each food item for men and women separately using data from three 24 h dietary recalls (24HDRs) in a calibration study of the Multiethnic Cohort (men = 1141, women = 1150). Nutrient intakes were calculated from the QFFQ using the original-PS and the GS-PS, and were compared with 24HDRs. When intakes of energy and 15 nutrients were compared, absolute intakes calculated using the GS-PS were closer to intake levels of 24HDRs in both men and women. Using GS-PS did not affect intakes expressed as nutrient density or correlations between 24HDRs and the QFFQ. The current findings indicate that considering gender in PS determination can increase the accuracy of intake assessment by QFFQ for absolute nutrient intakes, but not for nutrient densities.

Follow-up study of children with growth deficiency

This follow-up study revealed that all the children with growth deficiency in the original study had slower growth velocity after termination of the study. Two years later, 56% of the sample was located and the measures were repeated. The experimental group had diets significantly higher in fat and zinc than did the control group. The amount of fat, calories, zinc, and protein intake in all the children's diets was significantly related to their percentile level for weight. The stress of all the mothers, both experimental and control, had increased, and there was a significant increase in stress in the experimental mothers. There was no difference in the children's home environments, but the parent-child interactions were significantly more positive between the experimental children and their mothers. This follow-up study demonstrates that children with growth deficiency benefited over time from the original intervention but need continued intervention for positive significant changes to persist.