The paradox, explained
Vitamin D is made in skin exposed to ultraviolet B radiation from sunlight. India has a great deal of sunlight. Deficiency here is nonetheless extremely common across age groups, income levels and regions.
The reasons are structural rather than puzzling, and they compound:
People are indoors. Office work, study, indoor domestic work, screens, and a well-founded preference for staying out of the midday heat mean most urban Indians get very little direct skin exposure to sun.
Clothing covers most skin. Cultural and practical dress across much of India leaves relatively little skin exposed, and synthesis requires exposed skin — sunlight through a window or through fabric does not produce vitamin D.
Air pollution filters UVB. Several Indian cities have particulate levels high enough to meaningfully reduce the radiation reaching ground level, and this is worst in winter, when the sun is already lower.
Darker skin needs longer exposure. Melanin is protective against UV damage and correspondingly slows vitamin D synthesis. A person with darker skin needs substantially more exposure than a lighter-skinned person to make the same amount — which is why guidance written for European populations underestimates Indian requirements.
Sun avoidance is actively practised. Sunscreen, umbrellas, and a cultural preference for avoiding tanning all reduce exposure further.
There is almost no fortification. Unlike several countries where milk, cereal and spreads are routinely fortified, India's food supply contains very little added vitamin D, so the dietary contribution most populations rely on is largely absent.
Put together, a country with abundant sunshine has a population that barely meets it.
Why it matters
Vitamin D's best-known role is enabling calcium absorption, which is why deficiency shows up as bone problems — rickets in children, bone pain and osteomalacia in adults, and contribution to osteoporosis later. Without adequate vitamin D, a good calcium intake is substantially wasted, a point made in calcium-rich Indian foods.
Beyond bone, deficiency is associated with muscle weakness and fatigue — which is how it most often presents in practice, as vague tiredness and aching that gets attributed to something else for months.
A caution worth stating: vitamin D has been claimed to prevent or treat a very long list of conditions, and the evidence for most of those claims is considerably weaker than the enthusiasm. Correcting a genuine deficiency is worthwhile and well supported. Taking large doses in the hope of preventing unrelated disease is not.
Sunlight, practically
The most effective and cheapest intervention, and the one people implement worst.
What matters is direct sunlight on bare skin, in the middle part of the day when UVB is actually present. Early morning and late evening sun feels pleasant and produces very little vitamin D, which is why the traditional advice to sit in the early morning sun is less effective than it sounds.
Expose as much skin as is practical — arms and legs rather than face and hands alone. Do it for a modest period several times a week rather than in long sessions, and stop well before burning. Darker skin needs longer than lighter skin. Sunlight through glass does not work.
Balance this against skin cancer risk and sensible sun protection, particularly for prolonged exposure. Short, regular, non-burning exposure is the target — not sunbathing.
For people who genuinely cannot manage this — night-shift workers, people who are housebound, those who cover fully for religious or cultural reasons — sunlight is not a realistic strategy, and supplementation on medical advice is the honest answer.
The food sources, which are few
India's dietary options are genuinely limited, and this is why food is not the answer here.
Fatty fish — mackerel, sardines, rohu and similar — are the best natural sources, which favours coastal and riverine diets.
Egg yolk contributes modestly.
Liver contributes.
Fortified foods — some milk, some breakfast cereals, some edible oils — where fortification exists at all. Check the label rather than assume.
Mushrooms contain some, particularly if exposed to ultraviolet light, though the form differs from that in animal sources.
For a lacto-vegetarian diet, which describes a very large share of India, the dietary contribution is close to negligible. This is the honest limitation: diet alone will not correct established vitamin D deficiency in most Indian diets, and any article suggesting a food list will fix it is misleading you.
Test rather than guess
This is the practical instruction.
Vitamin D status is measured with a straightforward blood test, and the result tells you whether you have a problem, how large it is, and — on repeat testing — whether treatment worked. Symptoms are too vague to diagnose on, and the widespread assumption that everyone in India is deficient, while often true, is not a basis for taking high doses.
Supplement only on medical advice. Vitamin D is fat-soluble and accumulates. Excessive intake causes hypercalcaemia, which is genuinely harmful and entirely avoidable. Doses used to correct deficiency are much larger than maintenance doses, are usually given for a defined period, and should be followed by re-testing — none of which is something to arrange for yourself from a pharmacy shelf.
Worth testing particularly: people with bone or muscle pain, older adults, pregnant and breastfeeding women, people who are housebound or fully covered, children with growth concerns, and anyone with a condition affecting fat absorption.
The short version
Get tested rather than assuming. Get modest, regular, midday sun on bare skin if your life allows it. Do not expect Indian food to fix a deficiency, because it cannot. Supplement only on medical advice and re-test afterwards. And make sure your calcium and protein intake is adequate too, since vitamin D exists to make calcium useful — the wider picture is in the guide to Indian foods and nutrients.
Who is most affected, and why it is not evenly spread
Deficiency in India is not distributed the way people assume, and the pattern is worth knowing.
Urban office workers are among the worst affected, which surprises people. Leaving home before the sun is high, working indoors, commuting in a vehicle and returning after dark produces a life with almost no exposure.
Women are disproportionately affected across the country — a combination of covering clothing, more time indoors, and repeated pregnancy and breastfeeding drawing on stores.
Older adults synthesise less efficiently as skin ages, and are more likely to be indoors.
Infants and young children, particularly those exclusively breastfed without supplementation, which is why paediatric guidance in India commonly recommends it.
People in polluted northern cities in winter, where the sun is low and the air is at its worst simultaneously.
What is striking is that rural agricultural workers, who might be expected to be well supplied, are frequently deficient too — because much outdoor work is done covered, and because dietary intake and general nutritional status are often poor.
The habit that costs nothing
If your working day allows it, the single highest-return change is a short daily break outdoors around the middle of the day, with arms exposed. Fifteen or twenty minutes, several times a week, without sunscreen on the exposed area, stopping well short of burning.
That is not a large ask, it is free, and for most people it does more than any food change available in the Indian diet. The obstacle is almost never knowledge — it is that midday is exactly when people are least likely to go outside.