Vitamin D Its Role In Your Health

By Dr. Robert Curtis

(Doctor of Chiropractic, Certified Medical Examiner (U.S. Dept. of Transportation), A.C.E. Certified Health Coach and Fitness Nutrition Specialist)

Published: 11/1/19

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Vitamin D has varied roles in the different systems of our bodies, from our digestive system, to our cardiovascular system, to our immune system, to things like mental health, regulation of our blood sugar, cancer resistance, and fertility, along with being a factor in disease processes. 

Of course its most known role relates to healthy bone consistency.

Below, I’ll first discuss what we know about its link to optimal body systems’ health and then will get into what we know about its role in disease processes.

Side note: click here to see my companion article, Vitamin D – The Basics – What’s Your Status?, where I address its different forms, sources, and what good levels are.


Vitamin D’s Link to Optimal Systems Health

Our skeletal and organ systems that vitamin D plays a role in.Hover to see image title. Source noted at end of article.

Concerning nervous system health

Cells in key areas of the brain have receptors for vitamin D.

Vitamin D has been shown to play a role in circadian rhythms and sleep, to affect the growth of nerve cells, and to have impacts on the developing brain. [1]

In regard to heart health

An indication of the importance of vitamin D and heart health is more evident in its lack than presence.

Accordingly, a number of studies report low blood levels of vitamin D are linked with heart disease. [2]

Pertaining to control of blood sugar

Again here, as with heart health, vitamin D's role and importance is more revealed in its lacking.

As such, a group of studies has shown that supplementing with vitamin D may help improve blood sugar management in some people with diabetes. [3]

Self glucose monitoring device.Hover to see image title. Source noted at end of article.

In relation to bone health

This is the most known area of vitamin D activity and impact.  As bones are living tissue and constantly reforming based on the stresses we put on them, their metabolism is dependent on the flow of various factors, including a big role for vitamin D.

In a primary role, vitamin D helps the body absorb calcium more efficiently, with calcium being a key mineral for our bones' strength.

Additionally, vitamin D collaborates with certain hormones to insure calcium remains at optimum levels in the blood, going so far as to prioritize calcium amounts in the blood over bones, as necessary, as calcium is also crucial in things like muscle contraction, including the heart.

When there is enough calcium in the blood, the overage is stored in the bones.

If calcium blood levels fall, the body will respond to raise them by first activating vitamin D stored in the liver to up the absorption of calcium from food and then by pulling calcium out of the bones.

An association has been demonstrated with sufficient levels of vitamin D in our blood (the 25(OH)D form) and a higher degree of bone density in correlation to studies that indicate there may be a reduction in fractures and falls in those supplementing with vitamin D. [4]

Concerning fertility

Vitamin D seems to help improve the motility of sperm cells imparting a positive effect on male fertility.

There are studies correlating better pregnancies with normal vitamin D levels.

These two points are drawn from a recent scientific review of numerous vitamin D studies. [5]


The Vitamin D Link to Disease Processes

Burning fire, a kin to inflammation.Hover to see image title. Source noted at end of article.

In relation to inflammation and immune function, including allergy

Numerous studies of immune-related conditions like atopic dermatitis and rheumatoid arthritis have shown a link to low levels of vitamin D.

In the lab, vitamin D seems to have “anti-inflammatory” and “antioxidant” properties.

Some studies in people with immune conditions (e.g. cystic fibrosis, multiple sclerosis, & obesity), show that supplementing with vitamin D reduces some inflammatory markers in the blood [6], although not all studies agree.

Some researchers think vitamin D, due to its effects on the immune system, may also help with serious food allergies.

Along these lines, concerning serious food allergies, some researchers have noted that vitamin D may have a helpful role in combating them.

This ties into a handful of smaller studies pointing out that with low vitamin D levels there is a notable increased risk for allergies to certain foods, but it was also asserted that more research was necessary. [7,8]


Vitamin D’s role in digestive diseases

Dietary fat is a needed component for the absorption of vitamin D (one of the fat soluble vitamins) thus, those who don’t absorb sufficient fat run the risk of accordingly having lowered levels of vitamin D.

Such persons can be those with celiac disease [9], inflammatory bowel diseases (IBD) like Crohn’s & colitis, or those who’ve undergone gastric bypass surgery. [10, 11]

This ties in with the flip side of these disease challenges in that good vitamin D levels are observed in those with healthy guts (good gut microbiome status).

Sub-optimal vitamin D has been associated with poorer gut microbiome status, inflammation of the gut, and gut related diseases such as IBD and colon cancer, whereas supplementation has been shown to be helpful in relieving colitis. [12]


As it relates to bone diseases

When we don’t get enough vitamin D (and calcium) regularly, bones can become weak and brittle.  

So, getting sufficient amounts of vitamin D and calcium regularly are necessary to maintain bone health, and severe vitamin D deficiency can lead to weakened bone diseases like rickets in children and osteomalacia in adults.

Osteoporosis (loss of bone mass) can occur over time as well with general insufficiency (as opposed to a severe deficiency) of vitamin D, and calcium, too. [13]


Pertaining to heart disease

Research has indicated that higher levels of vitamin D in the blood may reduce blood pressure and the risk of heart disease by a small amount.

As such, taking vitamin D supplements may slightly lower blood pressure, but supplementing's effects on heart disease risk is not clear. [14]


In view of diabetes

An association has been shown in people with pre-diabetes having higher levels of insulin resistance along with low vitamin D levels. [15]

Low levels may also increase the risk of developing diabetes. [16]


With respect to neurological and mental diseases

Concerning illnesses, like depression, a growing body of evidence is demonstrating a connection to low levels of vitamin D. [17, 18]

In regard to an increasing risk for developing either Alzheimer’s or Parkinson’s diseases, a link is shown with Vitamin D at low levels. [19]


Concerning cancer

It’s not just colon cancer that’s associated with low levels of vitamin D.  Higher levels of vitamin D are associated with lower risk for prostate, and breast cancers.

In the lab, cancer cells don’t seem to do as well when exposed to higher levels of vitamin D.  They don’t divide or invade other tissues as well, and they seem to die easier.

It’s unclear whether supplementing with vitamin D would reduce the risks of cancer in people. [20]


Summation and Final Thoughts

Vitamin D has many health-promoting roles in the body.  Most of the evidence is for bone health, but it’s also associated with a healthy immune system, digestive system, heart health, mental health, blood sugar regulation, fertility, and resistance to cancer.

However, the strongest evidence for what vitamin D deficiency causes involves rickets and osteomalacia. The rest of the conditions have some evidence, but it’s not clear to what extent they’re caused by vitamin D deficiency/insufficiency, or what other factors also come into play.

In the realm of a plant-based diet, vitamin D has a crucial role, as with any diet – and with sunlight, is just as readily produced, and otherwise fairly easily obtained in foods or supplements.

Testing your vitamin D levels allows you to determine if you’re at good levels already and should continue what you’re doing or need to make changes.

When testing, keeping in mind the time of year is important as well, as sun intensity is greatest in late spring on into the beginning of summer, then diminishing gradually, falling to its lowest point late fall on into the beginning of winter.

Accordingly, you would get more vitamin D production in your system during the period of greater sun intensity, and would likely register higher amounts in your test during that time, and typically the lowest levels would result during the late fall into early winter.


Click here to see my companion article, Vitamin D – The Basics – What’s Your Status?, where I address its different forms, sources, and what good levels are.


Looking to try out transitioning to a whole-food, plant-based diet?

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By the way, if you do want to print it, note in full it's fifty-four pages but you're given options to reduce the page count by eliminating sections or not printing pictures for example. 

It does look pretty sharp and more enticing with full colored pictures though : )

Oh yeah, and as I just noted above, if you do sign up, I'll become your Certified Meal Garden Professional host – but again; no pressure, no obligation, no credit card – just sharing of my other resources that you can pursue if and when you want : )

In any case, the free account may give you all that you want and need.

Last but not least, it is advised that for any dietary changes you consult with your primary health care professional and or dietician.


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Article References:

Studies:

1. Pet, M.A. & Brouwer-Brolsma, E.M. (2016). The Impact of Maternal Vitamin ,D Status on Offspring Brain Development and Function: a Systematic Review. Adv Nutr. 7(4):665-78. doi: 10.3945/an.115.010330.
LINK:  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4942857/

2. Zittermann A1, Gummert JF, Börgermann J. Vitamin D deficiency and mortality. Curr Opin Clin Nutr Metab Care. 2009 Nov;12(6):634-9. doi: 10.1097/MCO.0b013e3283310767.
LINK:  https://www.ncbi.nlm.nih.gov/pubmed/19710612

3. Krul-Poel YH1, Ter Wee MM2, Lips P2, Simsek S3. MANAGEMENT OF ENDOCRINE DISEASE: The effect of vitamin D supplementation on glycaemic control in patients with type 2 diabetes mellitus: a systematic review and meta-analysis. Eur J Endocrinol. 2017 Jan;176(1):R1-R14. Epub 2016 Aug 2.
LINK: https://www.ncbi.nlm.nih.gov/pubmed/27484453

4. Christodoulou, S., Goula, T., Ververidis, A., & Drosos, G. (2013). Vitamin D and Bone Disease. BioMed Research International, 2013, 396541. http://doi.org/10.1155/2013/396541
LINK:  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3591184/

5. Cito G1, Cocci A2, Micelli E3, Gabutti A4, Russo GI5, Coccia ME6, Franco G7, Serni S2, Carini M2, Natali A2. Vitamin D and Male Fertility: An Updated Review. World J Mens Health. 2019 May 17. doi: 10.5534/wjmh.190057. [Epub ahead of print]
LINK: https://www.ncbi.nlm.nih.gov/pubmed/31190482

6. Wang, Q., He, Y., Shen, Y., Zhang, Q., Chen, D., Zuo, C., … Yu, Y. (2014). Vitamin D Inhibits COX-2 Expression and Inflammatory Response by Targeting Thioesterase Superfamily Member 4. The Journal of Biological Chemistry, 289(17), 11681–11694. http://doi.org/10.1074/jbc.M113.517581
LINK:  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4002078/

7. Rudders, S.A. & Camargo, C.A.Jr. (2015). Sunlight, vitamin D and food allergy. Curr Opin Allergy Clin Immunol. 15(4):350-7. doi: 10.1097/ACI.0000000000000177.
LINK:  https://www.ncbi.nlm.nih.gov/pubmed/26110686

8. Du Toitc, G., Foongc, R,-X.M. & Lack, G. (2016). Prevention of food allergy – Early dietary interventions. Allergology International. 65(4), 370–377. DOI: https://doi.org/10.1016/j.alit.2016.08.001
LINK:  http://www.allergologyinternational.com/article/S1323-8930(16)30106-X/fulltext#sec4

9. Grace-Farfaglia, P. (2015). Bones of Contention: Bone Mineral Density Recovery in Celiac Disease—A Systematic Review. Nutrients, 7(5), 3347–3369. http://doi.org/10.3390/nu7053347
LINK:  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4446755/

10. Narula, N. & Marshall, J.K. (2012). Management of inflammatory bowel disease with vitamin D: beyond bone health. J Crohns Colitis. 6(4):397-404. doi: 10.1016/j.crohns.2011.10.015.
LINK:  https://linkinghub.elsevier.com/retrieve/pii/S1873-9946(11)00313-8

11. Del Pinto, R., Ferri, C., & Cominelli, F. (2017). Vitamin D Axis in Inflammatory Bowel Diseases: Role, Current Uses and Future Perspectives. International Journal of Molecular Sciences, 18(11), 2360. http://doi.org/10.3390/ijms18112360
LINK:  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5713329/

12. Meeker, S., Seamons, A., Maggio-Price, L., & Paik, J. (2016). Protective links between vitamin D, inflammatory bowel disease and colon cancer. World Journal of Gastroenterology, 22(3), 933–948. http://doi.org/10.3748/wjg.v22.i3.933
LINK:  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4716046/

13. Reid, I.R. (2016). What diseases are causally linked to vitamin D deficiency? Arch Dis Child. 101(2):185-9. doi: 10.1136/archdischild-2014-307961.
LINK:  https://www.ncbi.nlm.nih.gov/pubmed/26203122

14. Legarth C1, Grimm D2, Wehland M3, Bauer J4, Krüger M5. The Impact of Vitamin D in the Treatment of Essential Hypertension. Int J Mol Sci. 2018 Feb 3;19(2). pii: E455. doi: 10.3390/ijms19020455.
LINK: https://www.ncbi.nlm.nih.gov/pubmed/29401665

15. Nur-Eke R, Özen M, Çekin AH. Pre-Diabetics with Hypovitaminosis D Have Higher Risk for Insulin Resistance. Clin Lab. 2019 May 1;65(5). doi: 10.7754/Clin.Lab.2018.181014.
LINK: https://www.ncbi.nlm.nih.gov/pubmed/31115227

16. Lucato P1, Solmi M2, Maggi S3, Bertocco A1, Bano G1, Trevisan C1, Manzato E1, Sergi G1, Schofield P4, Kouidrat Y5, Veronese N3, Stubbs B6. Low vitamin D levels increase the risk of type 2 diabetes in older adults: A systematic review and meta-analysis. Maturitas. 2017 Jun;100:8-15. doi: 10.1016/j.maturitas.2017.02.016. Epub 2017 Mar 21.
LINK: https://www.ncbi.nlm.nih.gov/pubmed/28539181

17. Kjærgaard, M., Waterloo, K., Wang, C.E., Almås, B., Figenschau, Y., Hutchinson, M.S., Svartberg, J. & Jorde, R. (2012). Effect of vitamin D supplement on depression scores in people with low levels of serum 25-hydroxyvitamin D: nested case-control study and randomised clinical trial. Br J Psychiatry. 201(5):360-8.
LINK: http://bjp.rcpsych.org/content/201/5/360.long

18. Berk, M., Williams, L. J., Jacka, F. N., O’Neil, A., Pasco, J. A., Moylan, S., … Maes, M. (2013). So depression is an inflammatory disease, but where does the inflammation come from? BMC Medicine, 11, 200. http://doi.org/10.1186/1741-7015-11-200
LINK:  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3846682/

19. Rimmelzwaan, L.M., van Schoor, N.M., Lips, P., Berendse, H.W. & Eekhoff, E.M. (2016). Systematic Review of the Relationship between Vitamin D and Parkinson's Disease. J Parkinsons Dis. 6(1):29-37.
LINK:  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4927872/

20. Pilz, S., Grübler, M., Gaksch, M., Schwetz, V., Trummer, C., Hartaigh, B.Ó., Verheyen, N., Tomaschitz, A. &  März, W. (2016). Vitamin D and Mortality. Anticancer Research. 36(3), 1379-1387.
LINK:  http://ar.iiarjournals.org/content/36/3/1379.long

Thank you, researchers!

Images:

1.  Vitamin D plays a role in many systems of our bodies.  Image by www slon pics from Pixabay (CCO license)  Click here to go to the image's Pixabay page.

2.  Sugar levels are revealed in the blood. Vitamin levels can be, too.  Image by Photo Mix from Pixabay (CCO license)  Click here to go to the image's Pixabay page.

3.  Inflammation, a common root of disease processes.  Image by Voltordu from Pixabay (CCO license)  Click here to go to the image's Pixabay page.

Thank you, image artists!





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