15/10/2020
Your Immune System, Vitamin D and Covid-19
There has been so much interest in whether Vitamin D sufficiency can reduce our chances of catching Covid-19 or reduce the severity of symptoms. Here I have looked at the science so you don't have to.
Vitamin D is formed by cholesterol and 7-Dehydrocholesterol in the skin when it is exposed to UV rays from sunlight and can also be found in animal products and mushrooms. It helps to keep calcium and phosphate levels steady in our bodies. Deficiency can lead to adverse outcomes for bone and tooth health AND importantly is important for immune health [1].
Approximately 50% of people have insufficient levels of Vitamin D, this can lead to increased risk of all cause mortality and we may need more Vitamin D than what is currently advised to reduce risks of chronic disease [2].
Vitamin D has many roles in the body including its role bone health and reducing osteoporosis. Insufficiency has been linked with autoimmune disease, cardiovascular disease, hypertension, osteoporosis and even some cancers. Vitamin D is a key factor linking innate and adaptive immunity, and both of these functions may be compromised under conditions of vitamin D insufficiency [3].
A good working immune system is important for overall health and can protect us from microbes and bacteria that can make us ill. It works because there are specialised cells that will jump into action when it senses "alien cells" (microbes and bacteria) . Your bloodstream and key areas of your body contain white blood cells that can fight and destroy the viruses and bacteria they find.
If the immune system is not working well you can imagine that you will fall ill more regularly and it will take you longer to recover from these illness and and as we have seen with Covid-19, it can sometimes be fatal. Therefore Vitamin D is important for a healthy immune system, a healthy immune system can support you to fight off infection including Covid-19 quicker and easier.
Several observational studies and clinical trials reported that vitamin D supplementation reduced the risk of influenza. Evidence supporting the role of vitamin D in reducing risk of Covid-19 includes that the outbreak occurred in winter, a time when vitamin D levels are lowest [4, 5].
A nutritional therapist can support you in improving your immune health through dietary and lifestyle recommendations that are tailored to you and could include, dietary investigation, Vitamin D testing and supplementation*. Book a free discovery call with me to find out how I can help you. https://www.lauraleenutritionandlifestyle.com
References
1. Aranow, C., 2011. Vitamin D and the immune system. Journal of Investigative Medicine. 59(6), pp. 881-886.
2. Nair, R., Maseeh, A., 2012. Vitamin D: The "sunshine" vitamin. Journal of Pharmacology and Pharmacotherapy. 3(2), pp. 118-126.
3. Hewison, M., 2012. An update on vitamin D and human immunity. Clinical Endocrinology, 76(3), pp. 315-325.
4. Zemb, P., Bergman, P., and Camargo, C.A., et al., 2020. Vitamin D deficiency and the COVID-19 pandemic. Journal of Global Antimicrobial Resistance. 22, pp. 133-134.
5. Grant, W.B., Lahore, H., McDonnell, S.L., 2020. Evidence that Vitamin D Supplementation Could Reduce Risk of Influenza and COVID-19 Infections and Deaths. Nutrients. 12(4), P. 988.
Laura Lee Nutrition and Lifestyle. Nutritional Therapist and registered Midwife. Health and wellbing www.lauraleenutritionandlifestyle.com