Here's what we should all know about the relationship between body composition and vitamin D, and what it means in our quest to finally make optimal vitamin D status achievable for all people.* 💡
so that it's absorbed properly, what you likely don't know is that it influences your vitamin D status in a perhaps surprising way.*Brittany Henderson, M.D.
So, simply put, the more body fat a person has, the more vitamin D they store in that body fat, leaving less vitamin D in circulation throughout the body .explains,"less serum vitamin D [aka, 25D], circulating in our blood means less D is available to our kidneys and other target tissues for conversion to its active, hormone form for its pleiotropic actions throughout our body."
Ferira goes on to say,"And mind you, that's just one way that adiposity can compromise vitamin D status and its ability to do its widespread job in our bones muscles, immune cells, brain, liver, etc."* What she means is that research now suggests that there are other mechanisms at play in the relationship between body composition and their vitamin D status and needs.
Another mechanism, albeit one still being full worked out via research: that those with obesity experience, the active hormone form of vitamin D in the body, which then"turns off" the production of 25-hydroxyvitamin D, or 25D, which is the form of vitamin D health care providers measure when performing a blood test to assess vitamin D levels. As a result, people with higher amounts of body fat have lower vitamin D status when tested.
As Ferira concludes,"Whether sequestration into fat tissue, a dilution factor due to body size, or wonky feedback loop metabolism of circulating vitamin D levels—or all three—adiposity inserts nuance into one's vitamin D status equation, so it's time to talk more about it."
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