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
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML