Abstract
Abstract
Background
There are indications that an increased intake of calcium has a vitamin D sparing effect, which might be explained by a decreased catabolism of 25-hydroxyvitamin D (25(OH)D). However, there are only a few studies where this has been examined.
Method
In the seventh survey of the Tromsø study, serum 25(OH)D and parathyroid hormone were measured, and questionnaires on calcium and vitamin D intakes filled in.
Results
There were significant interactions between sex, calcium and vitamin D intakes regarding serum 25(OH)D level. The analyses were therefore done stratified. In males there was, regardless of vitamin D intake, a significant decrease in serum 25(OH)D with increasing calcium intake. The difference in serum 25(OH)D between those with the highest and lowest calcium intakes was approximately 10%. In the females, there was in subjects with low vitamin D intake (< 7 μg/d) a significant increase in serum 25(OH)D with increasing calcium intake, which could not be explained by secondary hyperparathyroidism. In females with higher vitamin D intakes, increasing calcium intake was associated with lower serum 25(OH)D levels.
Conclusions
There is, at least in subjects with an adequate vitamin D intake, a negative association between calcium intake and serum 25(OH)D.
Funder
Helse Nord RHF
UiT The Arctic University of Norway
Publisher
Springer Science and Business Media LLC
Subject
Public Health, Environmental and Occupational Health,Nutrition and Dietetics,Endocrinology, Diabetes and Metabolism,Medicine (miscellaneous)
Cited by
8 articles.
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