Vitamin D Deficiency Despite Indian Sunlight?

Summer in India means that we are often looking to avoid the sun rather than seeking it . A large percentage of our day is spent indoors, whether this be in an air-conditioned office, driving in our car, using sunscreen, or simply being busy. It therefore seems somewhat ridiculous to receive a blood test showing that our levels of vitamin D are low. How can we suffer from a deficiency if we are surrounded by so much sunlight?

However, the amount of vitamin D that we produce in our bodies depends on many factors, such as UVB exposure, skin pigmentation, diet, and general health.

By knowing these factors, we can make sense of why vitamin D deficiency can be an issue in India, understand low vitamin D symptoms, and know what can actually help.

1. Your lifestyle is stopping you from getting enough sunlight.

On a typical day we may not be getting as much direct sunlight as we think. We may eat breakfast indoors, drive to work, sit at our desks for hours, and spend evenings at home.

Our skin produces vitamin D when exposed to UVB rays. However, sunlight that comes through normal glass windows will not provide us with the required UVB exposure to produce significant amounts of vitamin D.

In addition, the time of day, season, location, cloud cover, and air pollution can affect how much UVB we are receiving. Early morning sunlight may feel nice, but it won’t give us the same amount of vitamin D-producing potential as stronger midday sunlight.

This means that even if we live in a sunny city we could still suffer from a vitamin D deficiency without knowing how little effective sunlight we are actually getting.

2. Indian Skin Has a Role to Play, Too

Melanin provides skin protection with color and UV resistance. It also minimizes vitamin D production from UVB.

Therefore, those with darker skin may need a higher intensity of UVB than someone with a lighter skin type to produce the same amount of vitamin D.

This does not mean they have an unhealthy skin type or will develop a deficiency; however, it is another factor to consider when looking at your lifestyle, diet, and personal health.

It is also important to look after your skin by protecting it from sun damage. Rather than avoiding sunscreens or exposing yourself to harsh sunlight you should try to find a balance between being outdoors sensibly and protecting your skin.

3. A Nutritious Indian Diet Can Still Fall Short

A healthy meal could include dal, roti, sabzi, rice, and seasonal fruits. However, most common foods will not give you much naturally occurring vitamin D.

Foods such as egg yolk and oily fish contain some vitamin D. Fortified dairy products, plant-based milks, and cereals will also help boost your levels. However, not all foods are fortified.

Vegetarians and vegans may need to plan their diet carefully to ensure they get reliable dietary sources.

If you aren’t getting much vitamin D from food and there isn’t much sun exposure, then you are more likely to become deficient. Whilst it is important to eat healthily, this does not necessarily mean you will get enough vitamin D.

4. Low Vitamin D Symptoms Can Look Like Everyday Exhaustion

Feeling drained after work? Experiencing muscle weakness or unexplained aches? It's tempting to blame long hours, poor sleep, or an uncomfortable work chair.

Yet, persistent fatigue, muscle weakness, and bone discomfort can sometimes be low vitamin D symptoms. Some people with vitamin D deficiency, however, experience no obvious symptoms at all.

The complication is that these signs are not specific to vitamin D. Iron deficiency, thyroid problems, and other health conditions can produce similar complaints.

Instead of self-diagnosing from a symptom checklist, speak to a healthcare professional if problems persist. A blood test measuring 25-hydroxyvitamin D [25(OH)D] can help assess vitamin D status when testing is appropriate.

5. The problem is not always just sunlight and food.

Imagine that you are getting plenty of sunshine and eating a good diet, but your vitamin D levels are low. What then?

Some gut conditions may impact your absorption of fat-soluble vitamin D. The liver and kidneys can also be affected by certain conditions, plus some medications can affect your vitamin D levels.

Age and personal health factors matter too. Chronic vitamin D deficiencies cannot simply be overcome by increasing dosage and exposure to sunlight. A health professional can support you to identify possible causes and offer advice on an appropriate plan.

A review of evidence and guidelines on prevention and management of vitamin D deficiency in India was published in the Indian Journal of Endocrinology and Metabolism (2025). This highlighted that correct assessment is very important.

6. What Actually Helps Improve Vitamin D Levels?

The answer lies in determining the reason behind low levels and whether the deficiency is confirmed.

• Review your outdoors: Proper sun exposure may facilitate the formation of vitamin D, but there is no standard duration of exposure that works for everyone. Sunburns must be avoided.

• Revisit your diet sources: Consuming fortified food and proper natural sources can aid in increasing the vitamin D intake.

• Take tests if necessary: Your doctor will guide you about the necessity of a test and the interpretation of the results.

• Select supplements: Vitamin D3 helps in rectifying the problem of insufficient intake and deficiency if properly advised. High dosages are toxic, thus avoiding self-medication at any cost.

For individuals seeking to take up plant-based supplements, Rasayanam Vitamin D3 + K2 consists of vegan vitamin D3 made from lichen and K2 MK-7. Vitamin D3 aids calcium absorption, while vitamin K2 participates in bone metabolism. The product contains K2VITAL™ DELTA, which is the double-microencapsulated form of vitamin K2, which helps in stabilizing vitamin K2.

Whether the supplement suits an individual or not must be determined by one's need; it must not be taken for granted that all individuals with vitamin D deficiency require K2.

The Bottom Line

Although India can be sunny, there are many factors that can cause vitamin D deficiency. You may suffer from vitamin D deficiency due to spending a lot of time indoors, having higher skin pigmentation, not eating enough foods containing vitamin D, or certain health conditions.

Don’t write off any symptoms you are experiencing due to low vitamin D levels. Understanding the cause, getting your vitamin D levels checked (if appropriate) and finding a suitable solution can help you overcome this.

Frequently Asked Questions:

1. What is the difference between vitamin D insufficiency and vitamin D deficiency?

This depends on the level of vitamin D in your blood. Both are terms used to describe someone who is lacking in vitamin D. Your healthcare professional can explain what your 25-hydroxyvitamin D blood test means in relation to your health.

2. Why do my vitamin D levels keep dropping?

This may be because you are not dealing with the root cause of your deficiency. For example, you’re not getting enough sun exposure, not eating enough, or dealing with an absorption problem. If this happens, having regular blood tests and a treatment plan will help to prevent your vitamin D deficiency from returning.

3. Can vitamin D deficiency be asymptomatic?

Yes. Many people who are lacking in vitamin D will show no signs or symptoms. This means that symptoms can’t be used to diagnose vitamin D deficiency. Depending on individual risk factors and medical advice, it may be appropriate to have tests done.

4. What should I avoid doing if I have vitamin D deficiency?

If you are diagnosed with vitamin D deficiency due to certain symptoms, you should avoid taking high-dose vitamin D supplements or over-exposing yourself to sunlight. Your healthcare professional can advise you on what treatment is best for you based on your test results.

5. Will taking vitamin D with food improve absorption?

As vitamin D is fat soluble, taking it with some fatty foods will improve absorption. Please follow the instructions for your specific supplement.

Disclaimer: This article is for informational purposes only and should not replace professional medical advice, diagnosis, or treatment. Consult a qualified healthcare professional for vitamin D testing, deficiency management, and appropriate supplementation.