By Marc Sorenson, EdD. Sunlight Institute….
COPD is defined as a heterogeneous collection of conditions that can affect various structures within the lung in a number of ways, and usually cause difficulty in breathing. In 2005 there were 126,005 deaths in the US from COPD. Though there are multiple contributors to COPD such as tobacco smoke, occupational dusts, chemicals and air pollution, vitamin D and sun deficiencies may also play a role. Research has demonstrated that the severity of the disease is correlated directly to serum levels of vitamin D, and other research demonstrates that severe disturbed lung and peripheral muscle functions are more pronounced in COPD patients with vitamin D deficiency. In addition, recent research shows that cardiopulmonary exercise capacity is increased remarkably in people with high vitamin D levels compared to those with low levels. Of course, 90% of vitamin D blood levels are produced by sun exposure.
In other blogs, I have established that sun can prevent and even reverse osteoporosis, and it is also well-established that osteoporosis associates closely with COPD. There is a high prevalence of COPD in patients with osteoporosis, and the disease is also more severe in patients with osteoporosis compared with patients with normal bone mass.  One may intelligently conclude, based on this information, that a part of the cause for both diseases is a lack of sun-derived vitamin D (and perhaps other sun-stimulated photoproducts). It is surprising that little or no research has been done on the effects of sun exposure per se. I would think that in very sunny areas, the risk of the disease would be reduced profoundly.
Now doesn’t that make you breathe easier?
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 Kaul A, Gläser S, Hannemann A, Schäper C, Nauck M, Felix SB, Bollmann T, Ewert R, Friedrich N. Vitamin D is associated with cardiopulmonary exercise capacity: results of two independent cohorts of healthy adults. Br J Nutr. 2016 Feb 14;115(3):500-8
 Romme EA, Smeenk FW, Rutten EP, Wouters EF. Osteoporosis in chronic obstructive pulmonary disease. Expert Rev Respir Med. 2013 Aug;7(4):397-410.
 Silva DR, Coelho AC, Dumke A, Valentini JD, de Nunes JN, Stefani CL, da Silva Mendes LF, Knorst MM. Osteoporosis prevalence and associated factors in patients with COPD: a cross-sectional study. Respir Care. 2011 Jul;56(7):961-8.