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Although all vitamins are essential and serve unique and important functions in the body, many health experts agree that vitamin D is the most important vitamin because it plays a profound role in our overall health and vitamin D deficiency is very prevalent. It has been estimated that vitamin D insufficiency affects roughly 50 percent of the population worldwide [1]. At Elo approximately 90 percent of our members have low vitamin D upon joining.

What is vitamin D and what does it do? 

Vitamin D is a fat-soluble vitamin that is obtained through diet and sun exposure. Vitamin D plays an important role in bone health, calcium absorption, blood sugar regulation, cell proliferation and turnover, and immune function. Optimizing vitamin D levels may even help protect against severe COVID-19, type 2 diabetes, depression, as well as some autoimmune diseases, neurodegenerative diseases, and cancers [2, 3, 4, 5, 6]. Vitamin D is so important that its receptor is found in nearly all (if not all) cells in the body [7].

Several factors contribute to low vitamin D levels: 

  • Limited sun exposure: Sun exposure is the best way to get vitamin D but today people are spending more time indoors and avoiding the sun to minimize sun damage and skin cancer risk. 

  • It’s difficult to obtain through food: Few foods contain vitamin D, which makes it difficult to consume enough from food alone. It’s found mostly in fatty fish and fortified dairy products.

  • Older age: Vitamin D synthesis in skin declines gradually with older age.

  • Dark complexion: Melanin in dark skin reduces the skin’s ability to absorb UV radiation needed to synthesize vitamin D.

  • Living in cold or northern climates: People who live above 37°N latitude typically don’t get enough sun to synthesize vitamin D year-round.

  • Pregnancy and breastfeeding: Pregnant or breastfeeding women have increased vitamin D needs.

  • Obesity: Subcutaneous fat appears to sequester more of the vitamin, often resulting in low vitamin D levels.

  • Certain health conditions: Some conditions including cystic fibrosis, Crohn's disease, celiac disease, kidney or liver diseases, can interfere with vitamin D absorption and/or synthesis. People who have had gastric bypass surgery are also at greater risk for deficiency due to decreased absorption. 

How to get enough vitamin D

  • Increase consumption of vitamin D-rich foods like salmon, herring, canned tuna, eggs (with the yolk), and fortified foods like milk, yogurt, and breakfast cereals.

  • Get 10–30 minutes of unprotected midday sunlight most days.

  • Take a vitamin D supplement. Dosage will depend on your vitamin D level. For very low levels (<20 ng/mL) you may need to take 5,000 IU daily for several months to significantly improve your vitamin D status. For those in the 20-40 ng/mL range, a daily dose of around 2,0000 IU may be adequate, however it’s best to work with a health professional.

vitamin d capsules

References

  1. Nair, R., & Maseeh, A. (2012). Vitamin D: The "sunshine" vitamin. Journal of pharmacology & pharmacotherapeutics, 3(2), 118–126. https://doi.org/10.4103/0976-500X.95506

  2. Demir, M., Demir, F., & Aygun, H. (2021). Vitamin D deficiency is associated with COVID-19 positivity and severity of the disease. Journal of medical virology, 93(5), 2992–2999. https://doi.org/10.1002/jmv.26832

  3. Kayaniyil, S., Vieth, R., Retnakaran, R., Knight, J. A., Qi, Y., Gerstein, H. C., Perkins, B. A., Harris, S. B., Zinman, B., & Hanley, A. J. (2010). Association of vitamin D with insulin resistance and beta-cell dysfunction in subjects at risk for type 2 diabetes. Diabetes care, 33(6), 1379–1381. https://doi.org/10.2337/dc09-2321

  4. Examine.com. (2019, April). A D-fence against cancer? https://examine.com/members/deep-dives/article/a-d-fence-against-cancer/

  5. Yang, C. Y., Leung, P. S., Adamopoulos, I. E., & Gershwin, M. E. (2013). The implication of vitamin D and autoimmunity: a comprehensive review. Clinical reviews in allergy & immunology, 45(2), 217–226. https://doi.org/10.1007/s12016-013-8361-3

  6. Groves, N. J., McGrath, J. J., & Burne, T. H. (2014). Vitamin D as a neurosteroid affecting the developing and adult brain. Annual review of nutrition, 34, 117–141. https://doi.org/10.1146/annurev-nutr-071813-105557

  7. Bikle D. D. (2016). Extraskeletal actions of vitamin D. Annals of the New York Academy of Sciences, 1376(1), 29–52. https://doi.org/10.1111/nyas.13219

  8. National Institutes of Health. (2021, March 26). Office of Dietary Supplements - Vitamin D. National Institutes of Health – Office of Dietary Supplements. https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/