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400 IU of Vitamin D is just diluted by weight, and not stored in fat – Jan 2012

Volumetric Dilution, Rather Than Sequestration Best Explains the Low Vitamin D Status of Obesity.

Obesity (Silver Spring). 2012 Jan 19. doi: 10.1038/oby.2011.404.
Drincic AT, Armas LA, Van Diest EE, Heaney RP.
Department of Medicine, Creighton University, Omaha, Nebraska, USA.

Vitamin D status is known to be poor in obese individuals; there is no consensus as to the reason. Cross-sectional study of the relation between serum 25-hydroxyvitamin D (25(OH)D) concentration and body size in the baseline data from unsupplemented adults entering two study cohorts in our research unit, N = 686.

Regression analyses of body size variables against serum 25(OH)D concentration, using both linear and hyperbolic models.

The fit to a hyperbolic model of 25(OH)D against body weight completely removed the obesity-related component of inter-individual variability in serum 25(OH)D concentration.

The hyperbolic fit using total body weight was significantly better than any linear model, and specifically better than any using BMI.

Dilution of ingested or cutaneously synthesized vitamin D in the large fat mass of obese patients fully explains their typically low vitamin D status.

There is no evidence for sequestration of supplemental or endogenous cholecalciferol.
Vitamin D replacement therapy needs to be adjusted for body size if desired serum 25(OH)D concentrations are to be achieved.

PMID: 22262154
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Have not seen this concept previously

Note: They only analyzed obese taking 400 or less IU of vitamin D daily

Could be very different for people taking say 2,000 or 10,000 IU of vitamin D

See also VitaminDWiki

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