Exercise without Weight Loss Prevents Seasonal Decline in Vitamin D Metabolites
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Exercise as alternative to supplementation with a prohormone.
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And if you happen to have some wieght loss:
Conclusions: Our results indicate that vitamin D status may be marginally improved with weight loss in comparison with weight maintenance under similar conditions of supplemental vitamin D intake. Although additional studies in unsupplemented individuals are needed to confirm these findings, our results support the view that the association between obesity and lower serum 25-hydroxyvitamin D may be due to reversed causation with increased adiposity leading to suboptimal concentrations of circulating vitamin D.
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@DavidPS probably because less fat person has more vitamin d stores in relative to if they are fat
