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The Nitrogen Isotope Ratio Is a Biomarker of Yup'ik Traditional Food Intake and Reflects Dietary Seasonality in Segmental Hair Analyses

Title
The Nitrogen Isotope Ratio Is a Biomarker of Yup'ik Traditional Food Intake and Reflects Dietary Seasonality in Segmental Hair Analyses
Author
최경철
Keywords
circumpolar health; traditional food; dietary seasonality; nitrogen stable isotope ratio; biomarker evaluation
Issue Date
2019-11
Publisher
OXFORD UNIV PRESS
Citation
JOURNAL OF NUTRITION, v. 149, No. 11, Page. 1960–1966
Abstract
Background The nitrogen isotope ratio (NIR) is a promising index of traditional food intake for an Alaska Native (Yup'ik) population, which can be measured in blood and hair. However, the NIR has not been calibrated to high-quality measures of Yup'ik traditional food intake. Objectives Our primary objective was to examine associations between intakes of Yup'ik traditional food groups, including fish, marine mammals, birds, land mammals, berries, greens, and total traditional foods, and the NIR. In an exploratory analysis, we also examined whether NIR analyzed sequentially along hair could reflect dietary seasonality. Methods We recruited 68 participants from 2 Yup'ik communities in the Yukon Kuskokwim region of Southwest Alaska (49% female, aged 14–79 y). Participants completed 4 unscheduled 24-h food recalls over the period peak of RBC and hair synthesis preceding a specimen collection visit. The NIR was measured in RBCs ( n = 68), a proximal hair section (n = 58), and sequential segments of hair from individuals in the upper 2 quartiles of traditional food intake having hair >6 cm in length, plus 2 low subsistence participants for reference (n = 18). Diet–biomarker associations were assessed using Pearson's correlation and linear regression. Results Intakes of fish, marine mammals, berries, and greens were significantly associated with the NIR. The strongest dietary association was with total traditional food intake (R2 = 0.62), which indicated that each 1‰ increase in the RBC NIR corresponded to 8% of energy from traditional foods. Hair NIR appeared to fluctuate seasonally in some individuals, peaking in the summertime. Conclusions Findings support the use of the RBC and hair NIR to assess total traditional food intake in a Yup'ik population. Analyses of sequential hair NIR provided evidence of seasonality in traditional food intake, although seasonal variations were modest relative to interindividual variation.
URI
https://academic.oup.com/jn/article/149/11/1960/5527776https://repository.hanyang.ac.kr/handle/20.500.11754/117404
ISSN
0022-3166; 1541-6100
DOI
10.1093/jn/nxz144
Appears in Collections:
COLLEGE OF LANGUAGES & CULTURES[E](국제문화대학) > CULTURAL ANTHROPOLOGY(문화인류학과) > Articles
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