TY - JOUR
T1 - Potential determinants of Vitamin D in Finnish adults
T2 - A cross-sectional study from the Northern Finland birth cohort 1966
AU - Palaniswamy, Saranya
AU - Hyppönen, Elina
AU - Williams, Dylan M.
AU - Jokelainen, Jari
AU - Lowry, Estelle
AU - Keinänen-Kiukaanniemi, Sirkka
AU - Herzig, Karl Heinz
AU - Järvelin, Marjo Riitta
AU - Sebert, Sylvain
N1 - Funding Information:
This work was financially supported by the Academy of Finland (MRJ, grant number 24300796); Medical Research Council, UK (EH, grant number G0601653); Biocenter Oulu Doctoral Programme (SP); European Union's Horizon 2020 research and innovation programme (MRJ, SS, DMW, grant number 633595) for the DynaHEALTH action.
PY - 2017/3/1
Y1 - 2017/3/1
N2 - Objective: Evidence from randomised controlled trials suggests that vitamin D may reduce multimorbidity, but very few studies have investigated specific determinants of vitamin D2 and D3 (two isoforms of 25-hydroxyvitamin D). The aim of the study was to investigate the determinants of vitamin D2 and D3 and to identify the risk factors associated with hypovitaminosis D. Design: Cross-sectional study. Setting: Northern Finland Birth Cohort 1966. Participants: 2374 male and 2384 female participants with data on serum 25(OH)D2 and 25(OH)D3 concentrations measured at 31 years of age (1997), together with comprehensive measures of daylight, anthropometric, social, lifestyle and contraceptive cofactors. Methods: We assessed a wide range of potential determinants prior to a nationwide fortification programme introduced in Finland. The determinants of 25(OH)D2, 25(OH)D3 and 25(OH)D concentrations were analysed by linear regression and risk factors for being in lower tertile of 25(OH)D concentration by ordinal logistic regression. Results: At the time of sampling, 72% of the participants were vitamin D sufficient (≥50 nmol/L). Low sunlight exposure period (vs high) was associated positively with 25(OH)D2 and negatively with 25(OH)D3 concentrations. Use of oral contraceptives (vs nonusers) was associated with an increase of 0.17 nmol/L (95% CI 0.08 to 0.27) and 0.48 nmol/L (95% CI 0.41 to 0.56) in 25(OH)D2 and 25(OH)D3 concentrations. Sex, season, latitude, alcohol consumption and physical activity were the factors most strongly associated with 25(OH)D concentration. Risk factors for low vitamin D status were low sunlight exposure defined by time of sampling, residing in northern latitudes, obesity, higher waist circumference, low physical activity and unhealthy diet. Conclusions: We demonstrate some differential associations of environmental and lifestyle factors with 25(OH)D2 and 25(OH)D3 raising important questions related to personalised healthcare. Future strategies could implement lifestyle modification and supplementation to improve vitamin D2 and D3 status, accounting for seasonal, lifestyle, metabolic and endocrine status.
AB - Objective: Evidence from randomised controlled trials suggests that vitamin D may reduce multimorbidity, but very few studies have investigated specific determinants of vitamin D2 and D3 (two isoforms of 25-hydroxyvitamin D). The aim of the study was to investigate the determinants of vitamin D2 and D3 and to identify the risk factors associated with hypovitaminosis D. Design: Cross-sectional study. Setting: Northern Finland Birth Cohort 1966. Participants: 2374 male and 2384 female participants with data on serum 25(OH)D2 and 25(OH)D3 concentrations measured at 31 years of age (1997), together with comprehensive measures of daylight, anthropometric, social, lifestyle and contraceptive cofactors. Methods: We assessed a wide range of potential determinants prior to a nationwide fortification programme introduced in Finland. The determinants of 25(OH)D2, 25(OH)D3 and 25(OH)D concentrations were analysed by linear regression and risk factors for being in lower tertile of 25(OH)D concentration by ordinal logistic regression. Results: At the time of sampling, 72% of the participants were vitamin D sufficient (≥50 nmol/L). Low sunlight exposure period (vs high) was associated positively with 25(OH)D2 and negatively with 25(OH)D3 concentrations. Use of oral contraceptives (vs nonusers) was associated with an increase of 0.17 nmol/L (95% CI 0.08 to 0.27) and 0.48 nmol/L (95% CI 0.41 to 0.56) in 25(OH)D2 and 25(OH)D3 concentrations. Sex, season, latitude, alcohol consumption and physical activity were the factors most strongly associated with 25(OH)D concentration. Risk factors for low vitamin D status were low sunlight exposure defined by time of sampling, residing in northern latitudes, obesity, higher waist circumference, low physical activity and unhealthy diet. Conclusions: We demonstrate some differential associations of environmental and lifestyle factors with 25(OH)D2 and 25(OH)D3 raising important questions related to personalised healthcare. Future strategies could implement lifestyle modification and supplementation to improve vitamin D2 and D3 status, accounting for seasonal, lifestyle, metabolic and endocrine status.
UR - http://www.scopus.com/inward/record.url?scp=85014589059&partnerID=8YFLogxK
U2 - 10.1136/bmjopen-2016-013161
DO - 10.1136/bmjopen-2016-013161
M3 - Article
C2 - 28264828
AN - SCOPUS:85014589059
SN - 2044-6055
VL - 7
JO - BMJ open
JF - BMJ open
IS - 3
M1 - e013161
ER -