Ultraviolet radiation suppresses obesity and symptoms of metabolic syndrome independently of vitamin D in mice fed a high-fat diet (Geldenhuys et al., 2014)
Sunlight > vitamin D supps. It is known.
Brief review of vitamin D synthesis: TEAMWORK!
In brief: cholesterol -> 7-dehydrocholesterol in skin; sunlight (UV radiation) converts that into D3 which goes to liver on DBP and is made into 25(OH)-D3. That then goes to kidneys and is transformed into the active form, 1,25(OH)2-D3. What’s not shown in that graphic is when you have enough D, it’s instead converted into an inactive 24,25(OH)2-D3. This prevents toxicity from sunlight D.
Hypervitaminosis D (from supps) is rare but unpleasant.
This study showed sunlight also increases nitric oxide in the skin, which has effects beyond the D… may also be supplemented with NO-inducing skin creams (also speculative), if applied to the right spots…
Big tie-in with our beloved brown adipose tissue.
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