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Vitamin D is one of the essential nutrients that our body requires. Lack of adequate vitamin D in the body can lead to several health problems. The vitamin helps in strengthening the bones, reducing the risk of heart disease, rheumatoid arthritis and multiple sclerosis. Studies have pointed out that the deficiency of Vitamin D increases the risk of developing dementia. It also plays a major role in managing respiratory tract infections and autoimmune diseases among others  .
Our body can make its own vitamin D from sunlight. You can also get vitamin D from supplements. A very small amount comes from a few foods you eat, such as some fish, fish liver oils, egg yolks and fortified dairy, cereals and grain products  .
Vitamin D deficiency symptoms can appear in the form of any disease involving heart, bones and many organs. 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. Compared to women, vitamin D deficiency is increasingly reported in men  .
The deficiency of vitamin D leads to rickets. This occurs when a bone tissue doesn't properly mineralize, leading to soft bones and skeletal deformities. It is estimated that around one billion people worldwide have a vitamin D deficiency, according to the Harvard School of Public Health.
Researchers have also established a link between low vitamin D levels and prostate cancer. It was also found that men with erectile dysfunction were found to have low levels of vitamin D. People with low vitamin D levels were also found to be diagnosed with schizophrenia when compared to those who had a sufficient amount of vitamin D in their body, as noted by a study  .
Symptoms of Vitamin D Deficiency
In most cases, the signs of vitamin deficiency are not understood mainly because there are no visible symptoms  . Studies have reported that the symptoms can change over time, and are similar to symptoms of a wide range of ailments - making it difficult for an individual to understand whether they are suffering from vitamin D deficiency  .
Some of the common symptoms of vitamin D deficiency are as follows  :
- Thinning or brittle bones
- Back pain
- Muscle weakness
- Low endurance
- Constant sickness
- Constant mood swings
- Muscle pain
- Chronic pain
- Frequent bone fractures
- Hair loss
- High or rising blood pressure
Causes Of Vitamin D Deficiency
The central reasons responsible for the development of this vitamin deficiency are as follows  :
- Limited exposure to sunlight (living at a high altitude)
- Low consumption of the recommended levels of the vitamin
- Dark skin
- The inability of the kidneys to convert vitamin D to its active form
- The inability of the digestive tract to adequately absorb vitamin D
- Pregnancy and breastfeeding
- Gut health
Treatment For Vitamin D Deficiency
The three main treatments for vitamin D deficiency are as follows  :
- Take vitamin D supplements. The dosage recommended for most adults is 600 IU, and for adults over the age of 70, the RDA is 800 IU. For children under 12 months, it is 400 IU.
- Eat foods rich in vitamin D such as tuna, salmon, and mackerel, as well as fish liver oils. Also, foods such as cheese, and egg yolks contain small quantities of vitamin D.
- Increase exposure to natural sunlight by doing outdoor activities that are good for your body as well.
- Maintaining a healthy body weight
- Monitoring and treating medical conditions affecting your gut, kidney and liver
- Using vitamin D supplements
- Talking to a doctor about any changes in health
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-  Wilkinson, R. J., Llewelyn, M., Toossi, Z., Patel, P., Pasvol, G., Lalvani, A., ... & Davidson, R. N. (2000). Influence of vitamin D deficiency and vitamin D receptor polymorphisms on tuberculosis among Gujarati Asians in west London: a case-control study. The Lancet, 355(9204), 618-621.
-  Kamen, D. L., Cooper, G. S., Bouali, H., Shaftman, S. R., Hollis, B. W., & Gilkeson, G. S. (2006). Vitamin D deficiency in systemic lupus erythematosus. Autoimmunity reviews, 5(2), 114-117.