Vitamin D Deficiency in India — Why 70% of UP Population Is Affected

What Is Vitamin D and Why Does the Body Need It?

Vitamin D is a fat-soluble secosteroid hormone produced in the skin when it is exposed to UVB radiation from sunlight. It undergoes two conversions — first in the liver to 25-hydroxyvitamin D (calcidiol), and then in the kidneys to 1,25-dihydroxyvitamin D (calcitriol), its active hormonal form.

In this active form, Vitamin D regulates calcium and phosphorus absorption in the intestine — without adequate Vitamin D, the body absorbs only 10 to 15 per cent of dietary calcium, compared to 30 to 40 per cent when levels are sufficient. Children with severe deficiency develop rickets — soft, deformed bones. Adults develop osteomalacia — bone softening and pain — and accelerated osteoporosis.

Beyond bone, Vitamin D receptors are found in virtually every tissue in the body — the brain, heart, pancreas, immune cells, muscles, and skin. Research consistently links Vitamin D deficiency to increased risk of type 2 diabetes, hypertension, autoimmune disease, depression, certain cancers, and increased severity of respiratory infections.

Normal, Insufficient, and Deficient — Understanding Your Numbers

Vitamin D levels in the blood are measured as 25(OH)D — serum 25-hydroxyvitamin D — in nanograms per millilitre (ng/mL). The clinical classifications used in India are:

• •Sufficient: above 30 ng/mL — the level at which most physiological functions are adequately supported
• •Insufficient: 20 to 30 ng/mL — below optimal but not yet causing overt symptoms in most people; bone health, immune function, and metabolic processes are suboptimally supported
• •Deficient: below 20 ng/mL — associated with measurable impairment of calcium absorption, bone health, immune function, and increasing risk of associated conditions
• •Severely deficient: below 10 ng/mL — associated with clear clinical symptoms, significant bone loss, muscle weakness, and high fracture risk

The majority of studies conducted across North India, including UP, show mean Vitamin D levels in the population falling between 10 and 18 ng/mL — well within the deficient range, across all age groups including children, adults, and the elderly.

Why Is UP So Severely Affected? The Seven Real Reasons

1. Clothing and Cultural Practices

Across UP — in both rural areas and cities like Moradabad — the majority of women cover most of their body for religious, cultural, or social reasons. Vitamin D synthesis in skin requires UVB exposure on a significant body surface area. Covering 80 to 90 per cent of the skin eliminates most of the potential for synthesis, regardless of how sunny the environment is. This is a primary reason why women in UP are disproportionately more deficient than men.

2. Skin Tone and Melanin

Melanin — the pigment that gives skin its colour — acts as a natural sunscreen, absorbing and scattering UVB radiation before it can trigger Vitamin D production in deeper skin layers. A person with darker skin requires approximately 3 to 5 times longer sun exposure to produce the same amount of Vitamin D as someone with lighter skin. Even when skin is exposed, Indians with darker complexions need significantly longer exposure times — time that most people simply do not spend outdoors in direct sunlight.

3. Time of Day and Angle of Sunlight

UVB radiation — the specific wavelength required for Vitamin D synthesis — only penetrates the atmosphere when the sun is at a sufficiently high angle, generally between 10 am and 3 pm. Most people in Moradabad and across UP who do go outdoors do so early in the morning or in the evening — specifically to avoid midday heat. They receive plenty of UVA (which causes tanning) but very little UVB, meaning almost no Vitamin D is synthesised despite the sun exposure.

4. Air Pollution

The Indo-Gangetic Plain — which encompasses all of UP — consistently records among the worst air quality in the world. Particulate matter, dust, and pollution scatter and absorb UVB radiation before it reaches ground level. Studies in North Indian cities have directly measured significantly reduced UVB ground-level intensity compared to cleaner environments at the same latitude. Pollution is a significant, underappreciated contributor to the Vitamin D deficiency epidemic in UP.

5. Indoor Lifestyles and Glass Barriers

Glass blocks UVB radiation entirely. A person sitting next to a window in sunlight receives UVA but no UVB — and therefore synthesises no Vitamin D. As more people in Moradabad spend their working days indoors — in offices, shops, schools, factories — their effective UVB exposure drops to near zero regardless of how bright the day is outside.

6. Predominantly Vegetarian Diet Low in Vitamin D

Vitamin D is found naturally in very few foods. The richest dietary sources — fatty fish, cod liver oil, and egg yolks — are not staple foods across much of UP. For the significant proportion of the population that follows a vegetarian or predominantly vegetarian diet, dietary Vitamin D intake is negligible. The only plant-based food with meaningful Vitamin D is sun-dried mushrooms — not a routine part of the UP diet.

7. Limited Awareness and Infrequent Testing

Vitamin D testing is not part of routine health checks in most primary care or government health settings in UP. Many people do not know their levels are low. Symptoms are attributed to other causes, and doctors managing fatigue, back pain, or depression may not routinely include a Vitamin D test. At Jigyasa Hospital, we have made Vitamin D testing a standard part of our comprehensive health check packages precisely because it is so commonly deficient and so frequently missed.

Symptoms of Vitamin D Deficiency — What It Actually Feels Like

• •Persistent fatigue and low energy — a generalised, cellular-level exhaustion that does not resolve with rest; multiple studies confirm a direct correlation between low Vitamin D levels and unexplained fatigue
• •Bone pain and body aches — particularly in the lower back, hips, legs, and ribs; a deep ache present at rest that worsens with pressure on bones, frequently misdiagnosed as arthritis or muscular pain
• •Muscle weakness — difficulty climbing stairs, rising from a seated position, or lifting objects; severe deficiency can produce proximal muscle weakness that significantly impairs daily function
• •Frequent infections — recurrent colds, respiratory infections, and slow recovery; Vitamin D stimulates production of antimicrobial peptides in immune cells, and deficient individuals have measurably impaired innate immune responses
• •Depression and low mood — Vitamin D receptors in the brain regulate serotonin production; low Vitamin D is associated with increased rates of depression and generalised low mood
• •Hair loss — Vitamin D receptors in hair follicles regulate the hair cycle; deficiency is associated with alopecia areata and diffuse hair thinning, particularly in women
• •Impaired wound healing — slow healing after cuts or surgical procedures has been linked to low Vitamin D, which regulates the inflammatory and repair phases
• •In children — rickets: soft bones, bowed legs, delayed tooth eruption, poor growth, and distinctive enlargement of wrist and ankle joints; entirely preventable but still recognisable in children across rural UP
• •In elderly individuals — falls and fractures: Vitamin D deficiency significantly increases fall risk through its effects on muscle strength and balance, and fracture risk through effects on bone density

Who Is at Highest Risk in Moradabad and Surrounding Areas?

• •Women — particularly those who cover their bodies for cultural reasons, those who are pregnant or breastfeeding, and women above 40; pregnancy and lactation increase Vitamin D demands substantially, and deficiency in a pregnant mother directly affects fetal bone development
• •Exclusively breastfed infants without Vitamin D supplementation — breast milk contains minimal Vitamin D regardless of the mother's dietary intake; a leading cause of infantile rickets in India
• •Elderly individuals who stay primarily indoors and have reduced skin synthesis efficiency with age
• •People with diabetes — Vitamin D deficiency worsens insulin resistance and impairs pancreatic beta-cell function, creating a bidirectional relationship with type 2 diabetes
• •People with obesity — Vitamin D is fat-soluble and becomes sequestered in adipose tissue, making it less bioavailable; obese individuals require significantly higher doses to achieve adequate blood levels
• •People with kidney or liver disease — since Vitamin D activation occurs in these organs, disease affecting either impairs conversion to the active form regardless of intake

How Is Vitamin D Deficiency Diagnosed?

Diagnosis requires a blood test — specifically serum 25(OH)D (25-hydroxyvitamin D or calcidiol). This is the standard storage form measured in clinical practice and reflects total body Vitamin D status accurately. The test is a simple blood draw, available at Jigyasa Hospital, Moradabad, with results typically available within 24 hours. No special preparation is required.

At Jigyasa Hospital, we recommend including a Vitamin D test alongside calcium, phosphorus, PTH (parathyroid hormone), and a full blood count when evaluating fatigue, bone pain, or muscle weakness — because these conditions frequently coexist and interact. Do not attempt to diagnose or treat Vitamin D deficiency based on symptoms alone, as they overlap significantly with anaemia, hypothyroidism, depression, and other conditions.

Treatment — How to Correct Vitamin D Deficiency Properly

• •For deficiency (below 20 ng/mL): Standard loading regimen — commonly 60,000 IU of cholecalciferol (Vitamin D3) weekly for 8 to 12 weeks, followed by maintenance supplementation. Exact dose and duration are determined by the treating physician based on blood level, age, weight, and kidney function.
• •For insufficiency (20–30 ng/mL): Lower-dose supplementation or maintenance doses are usually sufficient, alongside dietary and lifestyle measures.
• •For maintenance after correction: A daily dose of 1,000 to 2,000 IU is commonly recommended for adults in India, confirmed and periodically monitored with blood tests.
• •Vitamin D3 vs D2: Vitamin D3 (cholecalciferol) is more effective at raising and sustaining blood levels than Vitamin D2 (ergocalciferol) and is the preferred form. Confirm D3 when purchasing supplements.
• •Calcium co-supplementation: When deficiency is severe and dietary calcium is also low, calcium supplementation is often added alongside. The two work together — Vitamin D without adequate calcium does not fully prevent bone loss.

Important: Do not self-supplement with high doses without medical guidance. Vitamin D is fat-soluble and accumulates in the body — toxicity, though rare, is possible with prolonged high-dose supplementation without monitoring. Always test, then treat, then retest. A follow-up blood test 3 months after starting supplementation confirms that levels have corrected and guides the transition to maintenance dosing.

Dietary Sources of Vitamin D — What to Include

While diet alone cannot correct clinical deficiency, adding Vitamin D-rich foods supports overall nutritional status and reduces the maintenance dose required.

• •Fatty fish — salmon, mackerel, hilsa (ilish), and sardines are among the richest natural food sources and are available in Moradabad's markets
• •Egg yolks — contain moderate amounts of Vitamin D and are an accessible source for non-vegetarians
• •Fortified milk and fortified cereals — provide small but consistent amounts when consumed daily
• •Sun-dried mushrooms — mushrooms dried in direct sunlight for several hours develop measurable Vitamin D and are the best plant-based source

For strict vegetarians and vegans, dietary sources are genuinely limited and supplementation is usually necessary.

Book Your Vitamin D Test at Jigyasa Hospital

The single most important step any adult in Moradabad or the surrounding region can take is to know their Vitamin D level. The test is inexpensive, requires no special preparation, and takes minutes. Yet the majority of the population has never had it done. You cannot correct what you do not measure.

At Jigyasa Hospital, Vitamin D testing is available as part of our routine health check packages and as a standalone test. Our physicians — including Dr. C.P. Singh (Senior General Physician), Dr. Amit Kumar Singh (Cardiologist), and Dr. Karishma Singh (Gynaecologist) — regularly review Vitamin D as part of managing fatigue, bone health, diabetes, cardiac risk, hormonal health, and pregnancy care.

One simple number — your serum 25(OH)D level — could explain years of unexplained symptoms and put you on the path to feeling genuinely well.

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📍 Address: Near Miglani Cinema, Rampur Road, Moradabad – 244001

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