Vitamin D in the Middle East
Middle Eastern countries — Saudi Arabia, UAE, Qatar, Kuwait, Bahrain, Oman, Iran, Iraq, Jordan, Lebanon, Egypt — enjoy some of the world's most abundant sunlight. They also record some of its highest vitamin D deficiency rates. The paradox is fully explained by cultural dress, heat-avoidance behaviour, indoor air-conditioned lifestyles, and dietary patterns.
Country prevalence data
- Saudi Arabia — adult women 78–97% deficient (< 20 ng/mL) across multiple studies; men lower but still 40–60%.
- UAE — 70–90% of Emirati adults deficient; ex-pat populations vary.
- Qatar — 82% of adults deficient in national survey.
- Kuwait — 60–70% adult deficiency; up to 90% in women.
- Iran — Tehran adults 60–75% deficient.
- Egypt — Cairo adults 55–75% deficient.
- Jordan — 60–70% adult women deficient.
The compounding factors
- Extreme heat — midday summer temperatures 40–50 °C drive everyone indoors during peak UVB hours.
- Air-conditioned indoor life — malls, cars, offices, homes; contemporary life largely enclosed.
- Conservative dress — thawb, abaya, hijab, niqab. Women fully-veiled in public have minimal skin exposure.
- Dark skin — Fitzpatrick IV-V predominant; more UVB needed per unit vitamin D.
- Dietary patterns — vitamin D-rich foods (oily fish, egg yolk) present but not dominant; regional cuisine largely low in fortified foods.
Regional guidance
Multiple Gulf and Levantine health authorities have issued vitamin D supplementation recommendations. Saudi Arabia, UAE, and Iran have official guidance for 1,000–2,000 IU/day for adults, with higher doses for veiled women and correction of documented deficiency. Compliance remains modest in many settings.
Fortification programs
Iran, Turkey, Saudi Arabia, and UAE have implemented dairy fortification at varying levels since 2000. Compliance and consumer awareness vary. Population- wide 25(OH)D improvements are measurable but modest so far.
Health consequences
Rickets remains present in Middle Eastern children despite year-round sun availability. Osteomalacia and hypocalcaemic seizures more common than in most Western populations. Elevated rates of gestational diabetes, PCOS, and cardiovascular disease have all been linked in part to endemic deficiency.
Practical guide for residents
- Assume deficiency — test 25(OH)D.
- Correct with 50,000 IU weekly × 8 weeks then 2,000 IU/day maintenance.
- Fully-veiled women may need 4,000 IU/day maintenance.
- Prenatal supplementation crucial — see pregnancy page.
- See hot climates page for related discussion.