Document Detail


The vitamin D status among Tibetans.
MedLine Citation:
PMID:  19508646     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
UVB from the sun and intake from food are the only human sources of vitamin D. Tibet is a unique region for comparisons of these sources: (1) it lies at a low latitude and at a high altitude and has very large annual fluences of UVB; (2) the traditional Tibetan food is poor in vitamin D. Blood samples were taken from 63 persons of different age, with different occupations and staying at different places. UVB doses at these places were measured. The samples were analyzed by a standard radioimmune assay for determination of the serum concentration of 25 hydroxyvitamin D (25(OH)D). The main finding was that among nomads, there seems to be severe vitamin D deficiency (serum levels of 25(OH)D<30 nM). We tentatively propose that the low level of 25(OH)D of nomads is related to their clothing and sun exposure habits. For persons of other occupations (students, teachers and farmers) the levels are higher, although a significant fraction of these persons also have lower levels than 75 nm, by many regarded as a limit for insufficiency related to a number of negative health conditions. The annual dose of vitamin D-generating UVB is about five times larger in Lhasa than in Oslo. Despite this, the average vitamin D status seems to be similar, except in the case of nomads. This phenomenon is certainly related to food habits. In conclusion, the 25(OH)D status among nomads in Tibet appears to be alarmingly low. However, for people of other occupations the status is more normal.
Authors:
Gelsor Norsang; LiWei Ma; Arne Dahlback; Ciren Zhuoma; Wangmo Tsoja; Alina Porojnicu; Zoya Lagunova; Johan Moan
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Publication Detail:
Type:  Journal Article     Date:  2009-04-06
Journal Detail:
Title:  Photochemistry and photobiology     Volume:  85     ISSN:  0031-8655     ISO Abbreviation:  Photochem. Photobiol.     Publication Date:    2009 Jul-Aug
Date Detail:
Created Date:  2009-07-03     Completed Date:  2009-09-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376425     Medline TA:  Photochem Photobiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1028-31     Citation Subset:  IM    
Affiliation:
Geophysics Institute, Tibet University, Tibet, China.
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MeSH Terms
Descriptor/Qualifier:
Humans
Tibet
Ultraviolet Rays
Vitamin D / blood*
Chemical
Reg. No./Substance:
1406-16-2/Vitamin D

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