What They Call a Deficiency Isn't a Deficiency
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What They Call a Deficiency Isn't a Deficiency
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The word deficiency points you toward food. But the active form of vitamin D is a hormone — called calcitriol — and your body makes it from sunlight, not from diet. When the system fails, it's not because you haven't eaten enough oily fish. It's because something is disrupting the production pathway.
In this episode, I walk through how calcitriol is actually made, why melanin-rich skin at northern latitudes disrupts that process at the very first step, what the data shows about who is most affected in the UK — and why some of the supplements GPs are prescribing may be making things worse, not better.
This is the science behind the parliamentary question. It's the reason I asked it — and it changes how you understand your own body.
calcitriol
vitamin D
melanin
health equity
endocrine system
Black health UK