Common Diseases Caused by Vitamin D Deficiency

Common Diseases Caused by Vitamin D Deficiency


What is vitamin D

Vitamin D is important for a good overall health and plays an important role in making sure our muscles, heart, lungs and brain function well. Our body can make its own vitamin D from sunlight. You can also get vitamin D from supplements, and a very small amount comes from a few foods you eat, such as some fish, fish liver oils, egg yolks and in fortified dairy, cereals and grain products. What makes vitamin D unique compared to other vitamins is that your body can make its own vitamin D when you expose your skin to sunlight, whereas you need to get other vitamins from the foods you eat.


How long should you spend in the sun to get enough vitamin D?

Finding out how long to stay in the sun in order to produce enough amounts of vitamin D can be very tricky and is different for every person, hence there isn’t one recommendation for everyone. The reason for that is that the amount of time you need to spend in the sun for your skin to make enough vitamin D depends on a number of factors, such as how dark your skin is or how easily you get sunburnt, the thickness of the ozone layer, the time of the year and what time of day it is. It is believed that short daily period of sun exposure without sunscreen (about 10-15 minutes for lighter-skinned people) during the summer months is enough for most people to make enough vitamin D.


Common causes for lack of vitamin D

Limited exposure to sunlight – Some of us live in northern latitudes, wear long clothes, or have a job that is taken place mostly indoors. Also sunscreen inhibits vitamin D production.

Dark skin – People with dark skin have higher levels of melanin, and this pigment reduces the skin’s ability to make vitamin D when exposed to sunlight.

Kidney and liver function – These organs play an important role in converting vitamin D to its active form, so kidney or liver diseases can reduce the ability of these organs to create biologically active form of vitamin D in the body.

Strict vegetarian diet – Food sources that contain vitamin D are mostly animal-based, such as fish and fish oils, egg yolks, cheese, fortified milk and beef liver.

Digestive problems – Certain medical conditions, such as Crohn’s disease, cystic fibrosis, and celiac disease can reduce the ability of the intestines to absorb vitamin D from food.

Obesity – Obesity may cause low vitamin D levels. Research suggests that vitamin D may become ‘trapped’ inside fat tissue so less of it is available in our blood circulation.

Vitamin D Deficiency Related Diseases & Conditions

Researchers are still working to fully understand how vitamin D works within our body and how it affects our overall health, but it is believed to be a link between vitamin D deficiency to quite a number of ailments:


  1. Osteoporosis – An adequate amounts of calcium and vitamin D are important for maintaining bone density and strength. A lack of vitamin D causes calcium-depleted bone, which further weakens the bones and increases the risk of fractures
  2. Asthma – Vitamin D deficiency is linked to lower lung functions and worse asthma control, especially in children. Vitamin D may improve asthma control by blocking inflammation-causing proteins in the lung, as well as increasing production of another protein which has anti-inflammatory effects.
  3. Heart health – Vitamin D deficiency may be linked to a higher risk of high blood pressure (hypertension) as well as increased risk of death from cardiovascular disease.
  4. Inflammation – It has been found that vitamin D deficiency is associated with inflammation, a negative response of the immune system. Vitamin D deficiency has been linked to a number of inflammatory diseases, including rheumatoid arthritis, lupus, inflammatory bowel disease (IBD) and type 1 diabetes.
  5. Cholesterol – Vitamin D regulates cholesterol levels in the blood: it has been shown that without adequate sun exposure, vitamin D precursors turn to cholesterol instead of vitamin D.
  6. Allergies – Studies show that children who had lower levels of vitamin D are more likely to have multiple food allergies.
  7. Influenza – Some studies showed a link between lack of vitamin D and common respiratory infections, and indicate that people with the lowest vitamin D levels report having significantly more cases of cold and flu than those with higher levels.
  8. Depression – Vitamin D deficiency is linked to depression: receptors for vitamin D are present on many areas of the brain and are involved in numerous brain processes, making it likely that this vitamin might be associated with depression and that vitamin D supplements might play an important role in treating depression.
  9. Type-2 Diabetes – Studies have demonstrated correlations between low vitamin D levels and the development of type 2 diabetes. Different studies provide evidence that vitamin D may contribute to glucose tolerance through its effects on insulin secretion and insulin sensitivity.


  1. Oral health – Several recent reports demonstrate a significant association between periodontal health and the intake of vitamin D. Also elderly patients with low vitamin D levels have a higher rate of tooth loss than those with high vitamin D levels.
  2. Rheumatoid arthritis – Low vitamin D may play a role in developing rheumatoid arthritis. Studies have found that women who get more vitamin D seem less likely to get rheumatoid arthritis. Also among people who already have rheumatoid arthritis, those with low vitamin D levels tend to have more active symptoms.
  3. Cancer – Vitamin D deficiency may be linked to cancer: a certain study indicated that more than 75% of people with a variety of cancers have low levels of vitamin D, and the lowest levels are associated with more advanced cancers. However additional research is required to determine whether higher vitamin D levels are related to lower cancer incidence or death rates.


What to do if you have a vitamin D deficiency?

Talk to your doctor if you’re concerned about the level of vitamin D you get from the sun and your diet. A simple blood test can determine whether or not you have vitamin D deficiency. Your doctor can advise if you need to take a vitamin D supplement. There is no consensus on vitamin D levels required for optimal health, and it differs depending on age and health conditions.

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