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The body requires 15-20 minutes of midday sun on bare arms and legs several times per week to produce adequate vitamin D High melanin in skin: The large South Asian, Middle Eastern, and African population groups have higher melanin levels that reduce UVB-driven vitamin D synthesis by 50-90% Sunscreen and clothing coverage: SPF 30 blocks approximately 97% of UVB rays (the wavelength needed for vitamin D synthesis), while full-body coverage further limits skin exposure to sunlight Limited dietary sources: Vitamin D occurs naturally in very few foods — primarily fatty fish, egg yolks, and fortified dairy — and most diets do not provide the 600-800 IU daily recommended intake Building design: Many residential buildings and offices use UV-filtering glass that blocks the UVB wavelengths necessary for vitamin D production, so even sitting near a window does not help These combined factors create what researchers call the "sunshine paradox" — vitamin D deficiency rates in the Gulf region are comparable to Northern Europe despite receiving several times more annual sunlight

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