India Has the Sun, So Why Are 58% of Our Kids Low on Vitamin D?

India receives more sunshine than most countries in the world, yet vitamin D deficiency is one of our most common nutritional problems. A six-state study of 2,500 children and teenagers found that fewer than half had enough.

The reason is not the sun — it is how we live. We work, study and play indoors during the exact hours when the sun’s UVB rays are strong enough to make vitamin D in our skin.

58% of Indian children and teens aged 5–18 had low vitamin D — deficient or insufficient. Only about 4 in 10 had enough. (Six-state study, 2,500 kids, Scientific Reports 2022.)

The Numbers

• 20% deficient, 38% insufficient
• Urban kids 30.2% deficient vs rural 21.6%
• Girls: 2.18× the odds vs boys
• Overweight kids: 2.38× the odds
• Deficiency climbs from 14% at ages 1–4 to 24% at ages 10–19

Why, In A Country This Sunny?

The vitamin D window is 11am–3pm, and most of us spend all of it indoors.

Dal, roti, rice, sabzi, achaar, namkeen — almost zero vitamin D. The real food sources are animal ones: oily fish, egg yolk, liver.

Unfortified milk is roughly 2 IU per 100 ml. A full glass is about 5 IU. The RDA is 600.

Darker skin needs longer in the sun. Full sleeves, dupattas and umbrellas cut it further. Window glass blocks UVB — a balcony behind glass does nothing.

Five Fixes

1. 30–45 min of midday sun, 11am–3pm, five days a week, arms and legs out.
2. Aim for 600 IU/day — the ICMR-NIN 2020 RDA for adults, raised from 400 IU.
3. Buy milk and oil carrying the FSSAI +F logo. Easiest win on the shelf.
4. Egg yolk or oily fish 3–4× a week if you eat them. Pure veg? Fortified food plus sun has to do the lifting.
5. Test before you dose: under 12 ng/ml is deficient, 12–20 insufficient, above 20 sufficient.

Why a sunny country still runs short

Vitamin D is made when skin is exposed to midday sun, so several everyday habits quietly cut our supply: office and school hours indoors, full-sleeved clothing, sunscreen and umbrellas, pollution, and crowded high-rise housing. Darker skin, which protects against sun damage, also needs longer exposure to make the same amount. And a balcony behind window glass does not help — glass blocks the UVB rays your skin needs.

The carousel

The five slides from our Instagram and X post — swipe through them, save them, share them.

Sources

1. Khadilkar A, et al. Vitamin D status and determinants in Indian children and adolescents: a multicentre study. Scientific Reports 12:16790 (2022)The headline 58% low (20% deficient + 38% insufficient, survey-weighted), 42% sufficient, urban 30.2% vs rural 21.6% deficient, girls 28.4% vs boys 23.9%, and the odds ratios: female 2.18×, overweight 2.38×, urban 2.03×. n=2,500, ages 5–18, six states, dried blood spots by LC-MS/MS, IAP cut-offs.
2. ICMR-NIN. Dietary Guidelines for Indians, 2024The age trend from the Comprehensive National Nutrition Survey — 13.7% deficient at ages 1–4, 18.2% at 5–9, 23.9% at 10–19 (rounded to 14% and 24% on the slide). Also the guidance that adequate sunlight is needed to meet vitamin D requirements, and the note that food-table values are for unfortified milk and oil.
3. ICMR-NIN Expert Group. Nutrient Requirements for Indians — RDA and EAR, 2020The 600 IU/day RDA for adults and the 400 IU EAR, and that the RDA was raised from 400 IU in the 2010 edition.
4. Indian Academy of Pediatrics. Revised Guidelines on Prevention and Treatment of Vitamin D and Calcium Deficiency, 2021Sun exposure of 30–45 minutes for older children, at least five times a week, around midday (11 AM–3 PM), over 15–40% of body surface. The cut-offs: deficient under 12 ng/ml, insufficient 12–20, sufficient above 20. The safety numbers: toxicity above 100 ng/ml with hypercalcaemia, 50–100 ng/ml to be viewed with caution, 60,000 IU pack sizes, and parenteral megadoses above 300,000 IU not recommended.
5. G R, Gupta A. Vitamin D Deficiency in India: Prevalence, Causalities and Interventions. Nutrients 6(2):729–775 (2014)Unfortified milk at roughly 2 IU per 100 ml; that vitamin D’s main food sources are animal foods while Indian staples carry almost none; and the reasons deficiency persists in a sunny country — melanin, covering clothing, crowded high-rise housing, air pollution and indoor work.
6. FSSAI. Press release on milk fortification standards, 6 September 2018That FSSAI sets upper and lower limits for vitamin A and D in fortified milk, and that dairies adopt it on self-compliance — the basis for “look for the +F pack”. No IU figures are quoted on the slides, because the press release does not state them.

General information, not medical advice. Figures are taken from the sources above; if you have a medical condition, speak to your doctor before changing your diet or activity.