It is one of the great paradoxes of Indian health: a sun-drenched country where study after study finds 70 to 90 per cent of people deficient in vitamin D, the sunshine vitamin. Office workers, homemakers, students and even outdoor labourers show low blood levels. Vitamin D is essential for calcium absorption and bone strength, but research has also tied it to immunity, muscle function and mood. Deficiency often announces itself vaguely, as body aches, fatigue or frequent illness, which is why it goes unrecognised for years. The reasons are cultural and modern as much as medical, and the fixes are simpler than most people expect.

What vitamin D actually does

Vitamin D functions more like a hormone than a vitamin. Its best-established job is regulating calcium and phosphate, the minerals that keep bones dense and teeth strong. Without enough of it, children can develop rickets, with bowed legs and delayed growth, while adults develop osteomalacia, softening of the bones that causes deep aches in the back, hips and legs. Muscles also weaken, raising the risk of falls in the elderly. Beyond bones, vitamin D receptors exist on immune cells, and low levels are associated with more frequent respiratory infections. Emerging research is exploring links with depression, diabetes and heart disease, though these connections are not yet proven to be causal. What is certain is that bones cannot stay strong without it, no matter how much calcium you eat.

Why sunshine alone is not fixing it

Humans make vitamin D when UVB rays strike bare skin, so abundant sun should mean abundant vitamin D. In practice, several things intervene. Modern Indians spend most daylight hours indoors, in offices, classrooms and homes, and commute in covered vehicles. When outdoors, cultural norms and pollution both matter: full clothing coverage limits exposed skin, and the haze over many Indian cities filters out UVB. Sunscreen, while important against skin damage, blocks vitamin D synthesis when applied thickly. Skin pigmentation plays a role too: melanin is natural sun protection, which means darker skin needs longer sun exposure than lighter skin to make the same amount of vitamin D. Finally, the useful window is narrower than people assume. Early morning and late evening sun contain little UVB; the productive hours are roughly between 11 am and 3 pm, exactly when most people avoid the sun.

Symptoms that are easy to dismiss

Severe deficiency causes bone pain and muscle weakness, but most deficient Indians sit in the mild-to-moderate range, where symptoms are vague. Common complaints include persistent tiredness, generalised body aches, lower back pain that does not respond to rest, and frequent colds. Hair shedding, slow wound healing and low mood are reported too, though these have many causes. In children, watch for delayed teething, bowed legs or a reluctance to walk. In the elderly, deficiency contributes to the muscle weakness behind many falls. Because none of these symptoms is specific, doctors increasingly test vitamin D levels, measured as 25-hydroxyvitamin D in blood, in patients with unexplained aches or repeated fractures. Levels below 20 ng/ml are generally considered deficient.

How to get enough: sun, food and supplements

The most natural route is sensible sun exposure: 15 to 30 minutes of midday sun on the face, arms and legs, a few times a week, without sunscreen for that short window. Longer exposures should still be protected against skin damage. Food helps but cannot do the job alone, because very few foods contain meaningful vitamin D. Oily fish like sardines, mackerel and salmon are the best dietary sources, followed by egg yolks and mushrooms exposed to sunlight. Fortified milk, curd and edible oils are increasingly available in Indian markets and are worth choosing. For the frankly deficient, doctors usually prescribe weekly high-dose vitamin D3 (cholecalciferol) sachets or tablets for 8 to 12 weeks, followed by a daily or monthly maintenance dose. Vitamin D is fat-soluble, so taking supplements with a meal containing some fat improves absorption.

Can you take too much?

Yes, and this is where caution matters. Because vitamin D is stored in fat, megadoses accumulate. Excess causes high blood calcium, leading to nausea, excessive thirst, frequent urination, kidney stones and, in extreme cases, kidney damage. The craze for self-prescribed monthly mega-dose sachets has landed people in clinics with toxicity. Do not take high-dose supplements without a blood test and a doctor’s plan, and do not assume that more sun is always better either: the skin self-regulates vitamin D production, so sunbathing cannot cause toxicity, but it can cause burns and long-term skin damage. The safe path is test, treat the deficiency under guidance, then maintain with modest sun and diet.

FAQs

Does morning sunlight give vitamin D? Very little. UVB, the wavelength that triggers vitamin D synthesis, is strongest around midday. A short walk between 11 am and 3 pm is far more effective than an hour at 7 am.

Do I need vitamin D if I drink milk daily? Probably still yes, unless the milk is fortified. Ordinary milk contains calcium but negligible vitamin D, and without vitamin D the calcium is poorly absorbed.

Should everyone get tested? Universal testing is debated, but testing makes sense for people with bone pain, frequent fractures, very limited sun exposure, darker skin with indoor lifestyles, and the elderly.

India’s vitamin D paradox is a lifestyle problem with a lifestyle solution. A short midday break in the sun, fortified foods in the kitchen and a tested, doctor-guided supplement course for those who need it can close a deficiency that quietly weakens the bones of crores. The sunshine is free; the only cost is stepping into it.

Compiled by the Khabar 24h Editorial Desk from publicly available sources.