Abstract:

Objective To detect the daily dietary intakes of trace elements (copper, iron and zinc) in adult residents of mining area by duplicated diet and weighting dietary record, and explore the correlation between these two methods. Methods A total of 569 adult residents in 180 families were randomly selected from Dahongshan Copper Mine in Yunnan Province, and dietary investigations were conducted for three consecutive days. Daily dietary intakes of copper, iron and zinc were determined by weighting dietary record in all residents, and 60 residents randomly selected from these 569 residents were also investigated by duplicated diet. Data from “Chinese Dietary Reference Intakes (DRIs)” were served as controls. Results It was revealed by both methods that dietary copper, iron and zinc intakes in females were significantly lower than those in males （P<0.05）, while daily intakes in both males and females were lower than the tolerable upper intake levels. Among the residents investigated by both methods, the median intakes of copper, iron and zinc detected by weighting dietary record were 1.53 mg/d, 21.76 mg/d and 11.54 mg/d, respectively, and were significantly higher than those detected by duplicated diet (1.27, 16.29 and 7.56 mg/d, respectively)（P<0.05）. The data obtained by two methods were positively correlated (r=0.537, 0.656 and 0.560, respectively, P<0.05). Conclusion Daily dietary intakes of copper, iron and zinc in adult residents of Dahongshan Copper Mine are lower than the tolerable upper intake levels. The data determined by weighting dietary record are higher than those by duplicated diet, and the findings obtained by these two methods are significantly correlated.

Key words: dietary survey, duplicated diet, weighting dietary record, trace element, dietary intake