Hypovitaminosis D in British adults at age 45 y: nationwide cohort study of dietary and lifestyle predictors.

By E. Hyppönen, C. Power. American Journal of Clinical Nutrition, 2007

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Causal Relationship between Obesity and Vitamin D Status: Bi-Directional Mendelian Randomization Analysis of Multiple Cohorts (2013, neutral): “It is also possible that differences in lifestyle could contribute to lower 25(OH)D concentrations in obese compared to normal weight individuals, although the association between obesity and low 25(OH)D concentrations has been found to only modestly attenuate after adjustment for vitamin D-related ”
Vitamin D deficiency is a major global public health problem (2014, neutral): “Grupo País Edad Sexo n Estación 25(OH)D % 30 nmol/l % 50 nmol/l % 75 nmol/l de edad (Latitud) del año Promedio ( 12 ng/ml) ( 20 ng/ml) ( 30 ng/ml) (ng/ml) Infantes Alemania (34) 0 m 328* TA 13.7 (mediana) 69% (54 – 47° N) V: 24.6 I: 94% I: 6.5 V: 35% Niños Bélgica, 4 – 11 H/M 357† I/P 18.9±5.8 5%”
Comparison of vitamin D2 and vitamin D3 supplementation in raising serum 25-hydroxyvitamin D status: a systematic review and meta-analysis (2012, background): “Given the essential role vitamin D plays in maintaining bone health and the gathering proof of widespread deficiency within the UK population (10), it is essential that the most efficacious source of vitamin D is elucidated.”
The urgent need to recommend an intake of vitamin D that is effective. (2007, background): “The report by Hyppönen and Power in this issue of the Journal (1) highlights a frustrating and regrettable situation for nutrition researchers.”