Do you often feel tired, have body aches, or have bone pain? Sometimes we think these are normal things, things that happen because of too much work, but the hidden reason behind this may be a lack of vitamin D. Although many people don't pay much attention to it, this is something that has a huge impact on our physical health. Let's talk about this in detail and very simply today.
What is this vitamin D deficiency?
Simply put, vitamin D deficiency means that your body does not get enough vitamin D. This mainly affects the strength of your bones and muscles .
Vitamin D is an essential vitamin for the growth and maintenance of bones in our body. It is also very important for the functioning of our nervous system, musculoskeletal system, and immune system (i.e., our ability to resist disease).
There are three main ways we can get vitamin D:
- From sunlight: When our skin is exposed to sunlight, our bodies can produce vitamin D. However, it is a bit more difficult for people with darker skin and the elderly to make enough vitamin D this way.
- From the foods you eat: Some foods naturally contain vitamin D.
- Nutritional supplements: If recommended by a doctor, you can take them in the form of pills or syrup.
Despite these methods, vitamin D deficiency is a very common health problem throughout the world, including Sri Lanka.
Why is vitamin D so important for our bodies?
Imagine you're building a house. You need bricks. Calcium is like bricks for our bones. But you need cement to hold those bricks together. That's the role of vitamin D, like that cement.
Without vitamin D, our bodies cannot properly absorb the minerals calcium and phosphorus from food. These calcium and phosphorus are what help build strong bones and maintain healthy tissue.
Now let's see what happens if you continue to lack vitamin D:
1. First, the absorption of calcium from the intestines decreases. Then the calcium level in the blood decreases. We call this condition hypocalcemia .
2. When blood calcium levels drop, the body tries to restore it. To do this, the parathyroid glands are stimulated, releasing calcium stored in the bones into the blood.
3. As calcium continues to flow from the bones into the blood in this way, the bones gradually begin to dissolve and weaken. This is called bone demineralization .
This process can lead to osteomalacia in adults and rickets in young children. In both conditions, the bones are weak and prone to fractures .
What are the symptoms of vitamin D deficiency?
Most of the time, the symptoms of vitamin D deficiency are not obvious. Sometimes, there may be no symptoms at all. However, there are some common symptoms.
| Who is affected? | Visible features |
|---|---|
| Young children |
|
| Adults |
The important thing is, you can have a vitamin D deficiency without any of these symptoms. So if you have risk factors, it's best to talk to a doctor.
What are the causes of vitamin D deficiency?
There are several causes of vitamin D deficiency. Let's look at them one by one.
1. Not getting enough vitamin D
- Lack of exposure to sunlight: People who stay indoors, in offices, and who do not go out in the sun do not produce vitamin D.
- Dietary deficiency: This condition can also occur in people who eat too few foods rich in vitamin D (e.g., oily fish, eggs).
2. The body's inability to absorb or use vitamin D
Some medical conditions and medications can prevent our bodies from using vitamin D properly.
- Digestive system diseases: Diseases like Crohn's disease and Celiac disease make it difficult for the intestines to absorb vitamin D.
- Obesity: When there are too many fat cells in the body, those cells store vitamin D. This leaves no vitamin D for use in other parts of the body.
- Kidney and liver disease: Vitamin D is converted into an active form that the body can use by the liver and kidneys. People with diseases of these organs cannot process it properly.
- Certain surgeries: Vitamin D absorption may be impaired after stomach surgery for weight loss (e.g., gastric bypass).
- Certain medications: Long-term use of certain medications, such as cholesterol-lowering medications, epilepsy medications, and steroids, can reduce vitamin D levels.
Who is at higher risk?
Although anyone can develop vitamin D deficiency, some people are at higher risk.
| Risk group | Reason |
|---|---|
| People over 65 years of age | As we age, the skin's ability to produce vitamin D from sunlight decreases. |
| People with dark skin | The melanin pigment in the skin somewhat prevents the production of vitamin D from sunlight. |
| Small babies | Especially for babies who are exclusively breastfed, the amount of vitamin D they get from breast milk may not be enough. |
| People who go out less | People who are confined to bed due to chronic illnesses and those living in nursing homes do not get enough sunlight. |
How is vitamin D deficiency diagnosed and treated?
Diagnosis
The only way to know for sure if you have a vitamin D deficiency is to get a blood test . This test is called the 25-hydroxyvitamin D (25(OH)D) test. Your doctor will decide whether you need this test based on your symptoms and risk factors.
Treatment
The main goal of treatment is to restore and maintain healthy levels of vitamin D in the body. Your doctor will often prescribe vitamin D supplements to help with this.
- There are two types of vitamin D, vitamin D2 and vitamin D3. D3 (`Cholecalciferol`) is generally more easily absorbed by the body.
- Only a doctor can determine the dose you need and how long you should take it.
Warning: Never take vitamin D pills without medical advice. Vitamin D toxicity can be dangerous. Therefore, always take the medicine only in the dosage and for the duration prescribed by your doctor.
How to prevent vitamin D deficiency?
Prevention is the best cure. If you follow these simple steps, you too can protect yourself from vitamin D deficiency.
- Get Sun Exposure: It is best to get 15-20 minutes of sun exposure every day, before 10 am or after 3 pm. Sun exposure is good for your face, hands, and legs. But don't wait until you get sunburned, as it can lead to skin cancer.
- Eat foods rich in vitamin D:
- Oily fish like salmon, tuna, mackerel, sardines, etc.
- Egg yolk
- Beef liver
- Vitamin D-fortified milk, yogurt, and cereals (read the label)
If you have any doubts about vitamin D deficiency, or if you have the symptoms mentioned above, the best thing to do is to see your family doctor for advice.
Take-Home Message
- Vitamin D is essential for the strength of our bones and overall health.
- Frequent fatigue, muscle and bone pain can be symptoms of vitamin D deficiency.
- People with dark skin, the elderly, and those who spend less time outside are at higher risk.
- This condition can be diagnosed with a simple blood test.
- If you are taking vitamin D supplements for treatment or prevention, be sure to take them only under medical advice .


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