Vitamin D measured in 4000 people for many years – longitudinal associations – May 2015

Longitudinal associations between lifestyle and vitamin D: A general population study with repeated vitamin D measurements.

Endocrine. 2015 May 30. [Epub ahead of print]
Skaaby T1, Husemoen LL, Thuesen BH, Pisinger C, Hannemann A, Jørgensen T, Linneberg A.
1Research Centre for Prevention and Health, Capital Region of Denmark, Copenhagen, Denmark,

VitaminDWiki Summary
BMI -0.3 ng/ml
per 1 kg/m2 increase in BMI
moderately/vigorously physically active
versus sedentary
4.50 ng/ml
(probably outdoors more)
healthy dietary habits
versus unhealthy dietary habits
1.8 ng/ml
1 drink increase in alcohol 0.05 ng/ml (virually nothing)
never smokers versus daily smokers 0.86 ng/ml

See also VitaminDWiki
Overview Obesity and Vitamin D
Overview Sports and vitamin D
Smoking reduces vitamin D - many studies

Several lifestyle factors have been found to be associated with vitamin D status in cross-sectional studies, but it is not clear whether a change in these factors can actually affect the vitamin D level. We investigated the association between repeated measurements of physical activity, body mass index (BMI), diet, alcohol consumption, and smoking habits, and corresponding levels of vitamin D during 5 years of follow-up of a large general population sample. We included 4185 persons who participated and had vitamin D (serum-25-hydroxyvitamin D, 25-OH-D) measurements in the Inter99 study at baseline (1999-2001) and 5-year follow-up. In a subsample, 25-OH-D was also measured at 1- and 3-year follow-ups. We used mixed models to examine the association between repeated measurements of lifestyle factors and 25-OH-D levels. In multivariable analyses of repeated measurements, the difference in 25-OH-D was -0.32 ng/ml (95 % CI -0.37, -0.28) per 1 kg/m2 increase in BMI; 4.50 ng/ml (95 % CI 3.84, 5.15) for persons moderately/vigorously physically active versus sedentary; 1.82 ng/ml (95 % CI 1.09, 2.56) for persons with healthy versus unhealthy dietary habits; 0.05 ng/ml (95 % CI 0.03, 0.07) per 1 standard drink/weak increase in alcohol consumption; and 0.86 ng/ml (95 % CI 0.36, 1.35) for never smokers versus daily smokers. Our study shows that lower BMI, a higher level of physical activity, a healthier diet and possibly a higher alcohol intake, and not smoking, are associated with higher 25-OH-D levels.

PMID: 26024976
Publisher wants $40 for the PDF


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    VitaminDWiki 200 IU needed to increase vitamin D levels by 1 ng (not 100 IU) – summary of 25 studies – Feb 2014

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