Why is Your Vitamin D Low? Causes, Symptoms & How to Increase It

Vitamin D, also called the "sunshine vitamin", plays a crucial role in maintaining strong bones by supporting calcium absorption, which ultimately helps in preventing conditions like osteoporosis and fractures. Apart from just bone health, Vitamin D also contributes to immune system regulation, muscle function, and overall well-being. 

Normal vitamin D levels are essential for maintaining energy, supporting mood balance, and promoting long-term health. Even though Vitamin D is very crucial, its deficiency is becoming more and more common around the world. 

Now, you must be wondering what causes vitamin D deficiency? Well, the reasons for Vitamin D levels deficiency are what we will be discussing in this blog. 

Also, through this blog, you will understand the importance of Vitamin D in your body, the reasons for Vitamin D levels deficiency, which diseases can be caused by low vitamin D and much more.

What is Vitamin D and Why is It Important?

Vitamin D is a fat-soluble vitamin that is like a hormone in our body, essential for calcium and phosphorus metabolism, maintaining healthy bones, teeth, muscles, and immune systems.

We always need to sit in the sun to get Vitamin D, according to our parents, but according to scientific research, when our body is exposed to ultraviolet B (UVB) rays, our body automatically produces Vitamin D3, which is then converted to its active form in our liver and kidneys to carry out its functions.

Types of Vitamin D (D2 vs D3):

Vitamin D exists in two main forms—Vitamin D2 and Vitamin D3—both help raise vitamin D levels, but D3 is generally more effective in maintaining adequate levels in the body.

Why Maintaining Healthy Vitamin D Levels Matters?

Meeting the daily requirement for vitamin D supports the maintenance of bone health, immune system function, and muscle strength. Optimal levels are also important for enhanced mood, energy, and overall health stability.

• Aids in calcium absorption for healthy bones and teeth
• Supports muscle strength and prevents falls
• Helps maintain healthy immune function
• May help regulate mood and overall health
• Aids in the reduction of inflammation in the body

Early Symptoms of Vitamin D Deficiency

Vitamin D deficiency can progress over time, and the symptoms may not be very noticeable during the early stages. However, if the levels remain low for a long time, it can impact bone strength, muscles, and health.

• Lack of energy
• Pain in the bones or lower back
• Muscle weakness or spasms
• Higher chances of fractures
• Frequent infections due to weaker immunity
• Slow healing of wounds
• Mood swings, depression, or irritability

Common Causes of Low Vitamin D Levels

Low vitamin D levels can result from a combination of environmental, lifestyle, and medical factors. Since vitamin D synthesis and activation involve multiple organs, disruption at any stage of this process may lead to vitamin D deficiency. The main causes of vitamin D deficiency are:

• Limited sun exposure: Staying indoors, wearing clothing that covers the skin, avoiding pollution, and wearing sunscreen may all decrease vitamin D production.
• Darker skin tone: Higher melanin levels decrease the skin’s efficiency in producing vitamin D from sunlight.
• Lack of a proper diet: A diet that is deficient in vitamin D may also cause a vitamin D deficiency.
• Ageing: As people age, their ability to produce vitamin D decreases, and their kidneys also lose efficiency, resulting in a lower level of active vitamin D.
• Obesity: Vitamin D may be stored in body fat, limiting its circulation in the bloodstream.
• Malabsorption disorders: This is a condition that affects the absorption of fats, which may also affect vitamin D absorption.
• Liver or kidney disease: These organs are essential for activating vitamin D into its usable form.

Lifestyle Factors That Reduce Vitamin D

Current lifestyle practices may play a significant role in affecting vitamin D levels in the body. This could be due to reduced outdoor activities and other practices.

Medications That Can Lower Vitamin D Levels

Some drugs can affect the body’s vitamin D absorption, metabolism, or activation. The chronic use of such drugs can raise the risk of vitamin D deficiency, particularly if the patient is not being monitored.

• Corticosteroids: These can affect the body’s calcium absorption and vitamin D metabolism.
• Anticonvulsants: Some anti-seizure medications can accelerate the breakdown of vitamin D in the liver.
• Weight-loss medications: These can affect the body’s fat absorption, as well as the absorption of fat-soluble vitamins such as vitamin D.
• Cholesterol-lowering agents: Certain bile acid sequestrants can affect the body’s vitamin D absorption.

Diseases and Health Risks of Vitamin D Deficiency

Vitamin D plays a vital role in maintaining strong bones, healthy muscles, and a well-functioning immune system, and a deficiency can affect multiple body systems, leading to various health problems.

How is Vitamin D Deficiency Diagnosed?

Vitamin D Deficiency is diagnosed through a simple blood test, known as the 25-Hydroxy Vitamin D [25(OH)D] test, which measures the level of vitamin D present in the bloodstream and gives an accurate assessment of overall vitamin D status.

Based on blood levels:

• Deficient: Generally below 20 ng/mL (50 nmol/L)
• Insufficient: Between 20–29 ng/mL
• Normal vitamin D levels (sufficient): Generally 30 ng/mL and above

Your doctor may use different criteria to determine the vitamin D status based on individual factors such as health status, age, and risk factors before suggesting lifestyle modifications or supplements.

How to Increase Vitamin D Levels Naturally?

Improving vitamin D levels naturally involves a combination of safe sun exposure, a vitamin D-rich diet, healthy lifestyle habits, and medical guidance when necessary to restore and maintain optimal levels.

• Safe Sun Exposure: Exposure to the sun for short periods several times a week, depending on skin type and climatic conditions.
• Vitamin D-Rich Diet: Fatty fish, egg yolks, and fortified dairy and cereal products should be included in the diet.
• Maintain a Healthy Weight: Weight management may help increase the availability of vitamin D in the body.
• Regular Monitoring: People at risk should get their blood tested periodically, as advised by a medical professional.
• Supplementation (if prescribed): Vitamin D supplements may be advised by a medical professional depending on the severity of deficiency.

The most effective way to prevent vitamin D deficiency is by maintaining adequate vitamin D intake through diet and appropriate sun exposure. However, prolonged unprotected sun exposure should be avoided, as it increases the risk of skin damage and skin cancer.

Recommended Daily Intake of Vitamin D

Your daily vitamin D requirement varies depending on age and life stage. The average recommended intake is listed below in both micrograms (mcg) and International Units (IU) for easy reference.

Best Food Sources of Vitamin D

Vitamin D is naturally present in only a limited number of foods, making it important to include the right sources in your daily diet. 

Consuming vitamin D-rich and fortified foods can help maintain healthy levels and support bone strength, immunity, and overall well-being.

When to See a Doctor?

While mild vitamin D deficiency may not always cause noticeable symptoms, medical evaluation is important in certain situations.

• Persistent fatigue, bone pain, or muscle weakness
• Frequent fractures or reports of low bone density
• Repeated infections or slow recovery from illness
• Existing kidney, liver, or digestive disorders
• Pregnancy, breastfeeding, or older age with limited sun exposure
• If blood tests show low or borderline vitamin D levels

A healthcare professional can recommend appropriate testing and personalised management based on individual needs.

Also Read:  Best Plant-Based Sources of Vitamin D for Vegetarians

Best Vitamin D Supplements Recommendation from  Zeelab Pharmacy

This list highlights some of the best vitamin D supplements available at Zeelab Pharmacy, offering effective options to support bone health, calcium absorption, and overall well-being.

Conclusion

Vitamin D plays a far more significant role in our health than many people realise. From strengthening our bones and muscles to boosting our immunity and overall health, vitamin D is a vital nutrient for us to have throughout our lives. 

Learning about the causes of vitamin D insufficiency can help us take necessary precautions to avoid its consequences. Regular monitoring of the vitamin D normal range, along with mindful sun exposure and inclusion of reliable sources of vitamin D in your diet, can make a meaningful difference. 

With early awareness and the right guidance, vitamin D deficiency is both preventable and manageable.

Also Read:  7 Hidden Signs of Vitamin D Deficiency in Winter

Frequently Asked Questions

Q. How serious is a Vitamin D deficiency?
A. Vitamin D deficiency can range from mild to serious. If left untreated, it may lead to bone pain, muscle weakness, frequent fractures, reduced immunity, and increased risk of osteoporosis or other bone-related disorders.

Q. What is the cause of vitamin D deficiency?
A. Low vitamin D levels are commonly caused by limited sun exposure, poor dietary intake, darker skin tone, ageing, obesity, and certain medical conditions affecting the liver, kidneys, or digestive system.

Q. What are the best natural vitamin D sources?
A. The best natural sources of vitamin D include safe sunlight exposure, fatty fish like salmon and mackerel, egg yolks, cod liver oil, and fortified dairy or cereal products.

Q. How much vitamin D should I have per day?
A. The daily requirement varies by age and health status, but most adults generally need 600-800 IU per day. Individual needs may differ, so medical guidance is recommended for accurate dosing.

Q. Can I take a vitamin D supplement every day?
A. Vitamin D supplements can be taken daily if prescribed or recommended by a healthcare professional. The dose depends on your blood levels, age, and overall health condition.

Q. Can vitamin D deficiency cause hair fall or joint pain?
A. Low vitamin D levels have been associated with hair thinning, muscle discomfort, and joint pain. Deficiency may affect bone strength and inflammatory balance, contributing to such symptoms in some individuals.

Q. Can lack of sunlight cause vitamin D deficiency?
A. Yes, insufficient sunlight exposure is one of the leading causes. Without adequate ultraviolet B (UVB) exposure, the skin cannot produce sufficient vitamin D.

Q. Which diseases can be caused by the deficiency of Vitamin D?
A. Vitamin D deficiency may lead to rickets in children, osteomalacia in adults, osteoporosis, increased fracture risk, weakened immunity, and potentially higher susceptibility to certain chronic health conditions.

Q. Are pregnant women at risk of low vitamin D?
A. Pregnant and breastfeeding women have higher nutritional demands. Without sufficient sunlight exposure or dietary intake, they may be at greater risk of deficiency.

Q. What happens when you have low vitamin D for a long time?
A. Long-term deficiency may lead to bone pain, muscle weakness, increased fracture risk, fatigue, and weakened immunity, affecting overall physical and mental health.