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//Vitamin D supplements 

Vitamin D not needed for healthy people, study finds

"This shows vitamin D has a relevant role to play, but it's not that important.

"GPs shouldn't be rushing around getting blood tests done for the average healthy person.

"Instead, the old-fashioned advice still holds true. Eat more fish, watch your diet and how you lead your life - unless you're specifically at risk."

People at high risk of vitamin D deficiency include children under five, pregnant and breastfeeding women, the over-65s and people at risk of not getting enough exposure to sunlight.

Those with darker skin, such as people of African, Caribbean and South Asian origin, and people who wear full-body coverings, as well as pale-skinned people have also been shown to be at higher risk.

The Paper:
John L. Haubrich's profile photo
This is a meta-analysis of studies, not a new study.  The problem with meta-analysis nutritional studies is that the data tends to come from poor studies, i.e. the populations are too small, or the studies are not well controlled.  Usually, though, the dosage is too small.  The goal of vitamin D supplementation should be to achieve blood levels comparable to those achieved by our hunter-gatherer ancestors, where our genome developed over thousands of generations.  This likely occurred in equatorial east Africa where we were exposed to uv-b sunlight year-around for much of the day.  It is believed our levels were between 50-80 ng/ml (25OHD).  It takes approximately 3000iu/100 lbs of body weight to maintain this level.  Most of these studies use just 400-800 iu, not enough to show a clear benefit other than to bone.  Further, vitamin D is just part of the picture.  Low D is a major contributor to a pro-inflammatory state of biochemistry that is also created by the dramatic shift in human diet to a domesticated grain and domesticated animal meat.  So, D alone, even in sufficient amounts may not have be able to reduce chronic inflammation.  It is foolish to treat nutritional supplements as drugs, designing tests to show that adding just one vitamin can have a dramatic effect on overall human health and that is the mistake that occurs throughout most of these vitamin studies that show good or bad results.  
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