Vitamin D deficiency is unusually common in India — here is how to know

India gets plenty of sun, yet vitamin D deficiency is one of the most common findings in our laboratory. That contradiction confuses people, so it is worth explaining.

Why sunlight is not enough

Your skin makes vitamin D when direct sunlight falls on it. In practice, several things get in the way at once:

• Most office work happens indoors, through glass, which blocks the wavelength responsible.
• Higher melanin in Indian skin means longer exposure is needed for the same amount of vitamin D.
• Sun avoidance during the hottest hours — sensible for other reasons — removes the window when synthesis is most efficient.
• Full-coverage clothing, air pollution and sunscreen each reduce it further.

The result is that people who feel they get "enough sun" are often deficient.

What deficiency actually feels like

It is rarely dramatic. Most people describe some combination of:

• Tiredness that sleep does not fix
• A dull ache in the lower back, hips or thighs
• Muscle weakness, especially climbing stairs or rising from a chair
• Hair fall
• Low mood, particularly through winter
• Bone pain that is often mistaken for arthritis

Because none of these are specific, deficiency is frequently missed for years.

The test to ask for

Ask for 25-Hydroxy Vitamin D. This is the storage form and the correct measure of status. There is a different test — 1,25-dihydroxy vitamin D — which sounds more advanced but is the wrong test for this purpose and can appear normal even in significant deficiency.

No fasting is needed and the sample can be given at any time of day.

Reading your result

Reported in ng/mL, results are conventionally grouped as:

Range	Interpretation
Below 20	Deficient
20–29	Insufficient
30–100	Sufficient
Above 100	Excessive

Two cautions. First, laboratories differ slightly in their cut-offs, so compare against the range printed on your own report. Second, more is not better — vitamin D is fat-soluble and accumulates, and high-dose supplements taken without supervision can push calcium too high.

What usually happens next

Correction is straightforward and normally involves a weekly loading dose for several weeks, then a maintenance dose. Your doctor decides both. A repeat test after about three months tells you whether it worked, which matters, because absorption varies more between people than most expect.

Your doctor may also check calcium, since the two are managed together.

Worth knowing

Deficiency recurs. People who correct their levels and stop everything are often back where they started within a year or two. If you have been treated before, an annual check is more useful than waiting for the symptoms to return.

---

This article is general information, not medical advice. Test results should be interpreted by your doctor alongside your symptoms and history.