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Older obese adults got one third the benefit from vitamin D – June 2011

Effect of adiposity on vitamin D status and the 25-hydroxycholecalciferol response to

supplementation in healthy young and older Irish adults.
Br J Nutr. 2011 Jun 28:1-9.
Kirsty Forsythe L, Livingstone MB, Barnes MS, Horigan G, McSorley EM, Bonham MP, Magee PJ, Hill TR, Lucey AJ, Cashman KD, Kiely M, Strain JJ, Wallace JM.
Northern Ireland Centre for Food and Health, University of Ulster, Coleraine BT52 1SA, UK.

There is increasing epidemiological evidence linking sub-optimal vitamin D status with overweight and obesity. Although increasing BMI and adiposity have also been negatively associated with the change in vitamin D status following supplementation, results have been equivocal.

The aim of this randomised, placebo-controlled study was to investigate the associations between anthropometric measures of adiposity and the wintertime serum 25-hydroxycholecalciferol (25(OH)D) response to 15 ?g cholecalciferol per d in healthy young and older Irish adults.

A total of 110 young adults (20-40 years) and 102 older adults ( ? 64 years) completed the 22-week intervention with >85 % compliance. The change in 25(OH)D from baseline was calculated. Anthropometric measures of adiposity taken at baseline included height, weight and waist circumference (WC), along with skinfold thickness measurements to estimate fat mass (FM). FM was subsequently expressed as FM (kg), FM (%), FM index (FMI (FM kg/height m2)) and as a percentage ratio to fat-free mass (FFM).

In older adults, vitamin D status was inversely associated with BMI (kg/m2), WC (cm), FM (kg and %), FMI (kg/m2) and FM:FFM (%) at baseline (r - 0·33, - 0·36, - 0·33, - 0·30, - 0·33 and - 0·27, respectively, all P values < 0·01). BMI in older adults was also negatively associated with the change in 25(OH)D following supplementation (? - 1·27, CI - 2·37, - 0·16, P = 0·026); however, no such associations were apparent in younger adults.

Results suggest that adiposity may need to be taken into account when determining an adequate wintertime dietary vitamin D intake for healthy older adults residing at higher latitudes.

PMID: 21733320
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Extra 600 IU of vitamin D in older adults for 22 weeks decreased

  • BMI (kg/m2), r - 0·33
  • waist circumference (cm),- 0·36
  • fat mass (kg and %),- 0·33
  • fat mass I (kg/m2), - 0·30
  • fat mass:FFM (%), - 0·33 or? - 0·27

Three conclusions in plain English

  1. The vitamin D blood levels of elderly increased only 1/3 as much if they were obese.
  2. Obese elderly need 3X as much vitamin D to get the same amount of increase in blood level as the non-obese elderly
  3. Obese young adults did not have the same problem - strange

See also VitaminDWiki