Not enough vitamin D in milk to reduce hypertension (no surprise)– RCT Dec 2013

Changes in Blood Pressure and Lipid Levels in Young Women Consuming a Vitamin D-Fortified Skimmed Milk: A Randomised Controlled Trial

Nutrients 2013, 5(12), 4966-4977; doi:10.3390/nu5124966 (doi registration under processing)
Laura Toxquiemail, Ruth Blanco-Rojoemail, Ione Wrightemail, Ana M. Pérez-Granados and M. Pilar Vaquero
Department of Metabolism and Nutrition, Institute of Food Science, Technology and Nutrition (ICTAN), Spanish National Research Council (CSIC), C/José Antonio Novais 10, 28040 Madrid, Spain

Vitamin D exerts a variety of extra-skeletal functions. Aim: to know the effects of the consumption of a vitamin D-fortified skimmed milk on glucose, lipid profile, and blood pressure in young women.

Methods: a randomised, placebo-controlled, double-blind parallel-group trial of 16 weeks duration was conducted in young women with low iron stores who consumed a skimmed milk fortified with iron and 200 IU/day (5 μg) of vitamin D (D-fortified group, n = 55), or a placebo without vitamin D (D-placebo group, n = 54). A reference group (n = 56) of iron-sufficient women was also recruited.

Results: baseline serum 25-hydroxyvitamin D was inversely correlated with total-cholesterol (r = −0.176, p = 0.023) and low density lipoprotein-cholesterol (LDL-chol) (r = −0.176, p = 0.024). During the assay, LDL-cholesterol increased in the D-placebo group (p = 0.005) while it tended to decrease in the D-fortified group (p = 0.07). Neither group displayed changes in total-cholesterol, high density lipoprotein-cholesterol (HDL-chol), triglycerides or glucose levels. Systolic (p = 0.017) and diastolic (p = 0.010) blood pressure decreased during the assay in the D-fortified group without significant differences compared to the D-placebo.

Conclusion: consumption of a dairy product fortified with vitamin D reduces systolic and diastolic blood pressure but does not change lipid levels in young women.

As with many other RCT: not enough vitamin D AND not given for long enough

PDF is online

See also VitaminDWiki

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