Vitamin D deficiency: everything you need to know

You've probably heard about " vitamin D deficiency" a lot lately, right? There's a reason for that. It's a problem that affects billions of people around the world. Simply put, it's caused by a lack of the essential " sunshine vitamin." While most people think of vitamin D as a bone health booster, it's actually important for many other things, including immune function, muscle strength, and mood. If you're constantly feeling tired, or have unexplained aches and pains, it could be a sign of vitamin D deficiency. Whether you're concerned about your own health or that of someone else, it's important to understand the causes, symptoms, risks, and treatments for vitamin D deficiency to stay healthy in the long run.

First, let's see, what is vitamin D? How do we get it?

Before we talk about deficiency, let's understand exactly what vitamin D is. It's actually a fat-soluble vitamin that acts like a steroid hormone. We get it mainly in two ways:

1. From sunlight (vitamin D3): When our skin is exposed to ultraviolet B (UVB) radiation from the sun, vitamin D3 (cholecalciferol) is produced within the skin.
2. From food and supplements (vitamins D2 and D3): Vitamin D2 (ergocalciferol) is obtained from plants (e.g., UV- treated mushrooms) and fortified foods. Vitamin D3 is obtained from animal foods (e.g., oily fish, egg yolks , liver ). This is the form of D3 that is most often given as supplements.

But the most important thing is this: D2 and D3 don’t work when taken orally. They have to be converted inside the body. First, they are converted in the liver to 25-hydroxyvitamin D [25(OH)D] – this is the level that is measured in blood tests. Then, mainly in the kidneys, they are converted to the hormone that actually works, 1,25-dihydroxyvitamin D (calcitriol). This calcitriol is what goes into cells throughout the body and does what vitamin D is supposed to do.

Why is it important to have enough vitamin D in the body? What happens if you don't have enough?

Knowing all this about what vitamin D does, you probably understand how important it is to prevent deficiency and treat it if it is insufficient. So, maintaining adequate levels of vitamin D in the body is very important for these things:

Vitamin D and Bone Health

Vitamin D is essential for the body to absorb calcium and phosphorus, which are essential for strong bones. If vitamin D is not enough, this absorption decreases and bones become weak. This can lead to rickets in young children and osteomalacia in adults. It also greatly increases the risk of osteoporosis.

Immune Regulation

Vitamin D also helps our immune system function properly. If we don't have enough vitamin D, we are more likely to develop diseases (especially infectious diseases). This may also be linked to some autoimmune diseases. When we correct our vitamin D deficiency, our immune system functions better.

Muscle strength, body aches and pains

Muscle weakness and muscle pain are common symptoms of vitamin D deficiency. Vitamin D is needed for muscles to function properly. When vitamin D levels are restored, the body becomes more resilient, and falls can be reduced, especially in the elderly.

Mood and Brain Health

There are receptors in the brain that respond to vitamin D. The relationship is a bit complicated, but data suggests that people who are deficient in vitamin D are at increased risk for depression, seasonal affective disorder (SAD), and possibly cognitive decline. Correcting vitamin D deficiency may be one way to maintain good mental health and brain function.

More health links

Research continues to investigate the link between vitamin D deficiency and cardiovascular disease, metabolic function (e.g., insulin sensitivity), and other chronic conditions. It appears that maintaining adequate vitamin D levels helps maintain physiological homeostasis.

Vitamin D deficiency: What exactly is it? How common is it? What are the causes?

As doctors, we diagnose vitamin D deficiency by measuring serum 25-hydroxyvitamin D levels. The range of levels can vary, but we generally classify them as:

• Deficiency: Less than 20 ng/mL (or less than 50 nmol/L)
• Insufficiency: Between 21 and 29 ng/mL (or between 51 and 74 nmol/L)
• Sufficiency: greater than or equal to 30 ng/mL (or greater than or equal to 75 nmol/L)

This is important: Don't just base your decisions on a blood test. Talk to your doctor to find out exactly what to do next, whether you have a vitamin D deficiency or another problem, based on your health status, symptoms, and risk factors.

Testing

I'm not saying everyone should get a vitamin D test. However, if you have symptoms of vitamin D deficiency, risk factors, or a condition like osteoporosis, it's a good idea to get this test done.

How can we safely increase our vitamin D levels?

Correcting vitamin D deficiency means increasing the amount in the body and maintaining that level, under the advice of a doctor.

Supplementation: The main remedy

• Dosage: To correct vitamin D deficiency, you need to take more than the recommended daily dose. Your doctor will prescribe the right dosage and regimen (usually vitamin D3) for you. This may include:
  • A high initial dose (loading dose) (e.g. 50,000 IU per week, for several weeks) - build up levels quickly.
  • Then take a low dose (maintenance dose) (usually 1,000–4,000 IU per day, depending on need) - and maintain that level.
• How to take: Take the exact dosage prescribed by your doctor. Taking too much can be harmful to the liver (hepatotoxic). Therefore, it is essential to take medicine for vitamin D deficiency under medical advice, to be safe.
• Follow-up: Blood tests should be done again in about 3 months to check whether vitamin D levels have improved and, if necessary, adjust the dosage.

Sunbathing wisely: just a tip

Even if you get vitamin D from the sun, if you have a significant deficiency, you can't make it up just by sunbathing (especially when considering risk factors and skin protection). A short period of sun exposure (10-20 minutes, a few days a week, without burning the skin, without sunscreen, on the arms and legs, at appropriate times) can help produce vitamin D. However, you should also consider the risk of skin cancer.

Food and drink: a small contribution

It's good to eat foods that contain vitamin D, but it's hard to make up for a big deficit with food alone. Consider these foods:

• Fatty Fish - Salmon, Mackerel, Sardines
• Cod Liver Oil (This is also high in vitamin A, so be careful)
• Egg Yolks
• Foods with added vitamin D (Milk, Yogurt, Juices, Cereals - see labels)
• Mushrooms Exposed to UV Light (Vitamin D2)

What can you do to avoid vitamin D deficiency throughout your life?

Here are some things you should continue to do to prevent vitamin D deficiency:

• Think about your risk: Based on the factors mentioned above (lifestyle, region, diet, age, skin color, and medical conditions), think about how likely you are to be vitamin D deficient.
• Stay balanced: It's best to get some safe sun exposure, eat foods rich in vitamin D, and for many people (especially those at higher risk, those in colder countries), talk to your doctor and take a low-dose supplement (like 1,000–2,000 IU D3 per day).
• See your doctor regularly: When you go for regular check-ups, talk to your doctor about factors that can contribute to vitamin D deficiency.
• Good health = good vitamin D levels: Things like maintaining a healthy weight and managing other illnesses help maintain good vitamin D levels.

Risks of untreated vitamin D deficiency

If vitamin D deficiency is left untreated, serious problems can arise in addition to symptoms.

• Severe damage to bones: Increased risk of osteoporosis, fractures (especially hip fractures), persistent bone pain, muscle weakness and falls. In severe cases, osteomalacia or rickets may develop.
• Effects on other diseases: Although research is still ongoing, it is possible that a severe deficiency of vitamin D may affect immune system diseases, infections, mental illnesses, and possibly even heart disease or metabolic diseases.
• Therefore, it is said that persistent vitamin D deficiency is an obstacle to quality of life.

Also learn about Vitamin D Toxicity

Just as it is important to prevent vitamin D deficiency, it is also not good to get too much vitamin D (from medications - this does not happen from food or sunlight). This is called vitamin D toxicity / hypervitaminosis D. This can cause an increase in calcium in the blood (hypercalcemia) and damage to the body. Symptoms such as nausea, vomiting, weakness, anxiety, and kidney damage can occur. This also shows how important it is to take the exact dose of vitamin D prescribed by your doctor when taking vitamin D medication.

A final word from Dr. Priya

My goal is to provide you with information that will help you live a healthier life. We all need to be aware of how common vitamin D deficiency is, how subtle its symptoms can be, how serious its effects are, and how easy it is to treat. While I have provided you with reliable information in this article, this is only a general awareness. Your health needs are unique to you. If you think you may be deficient in vitamin D, or if you have questions about your risk factors or supplements, please see your doctor or other qualified health professional. They can properly evaluate you and provide you with safe, effective advice and treatment that is right for you. Getting a vitamin D panel is a great first step to a healthy life!