A Comprehensive, Epidemiological and Ecological Descriptive Study on Vitamin D Status in Iran (308005 People, from 2009-2018)
Iran JPublic Health, Vol. 48, No.4, Apr 2019, pp.644-654
- Vitamin D given to ALL high schools girls in Iran – 75 percent deficiency dropped to 6 percent – April 2016
- Vitamin D levels in Iran increasing somewhat since 2001 – Dec 2017
- 96 percent of Iranian children have low vitamin D and markers of metabolic syndrome– Sept 2014
Increased use of D has the following
Studies showing increased Vitamin D consumption and associated
Increased levels of vitamin D
- Vitamin D levels increased in Saudi Arabia over a decade (more sun or supplements) – Sept 2021
- 26 X increase in Vitamin D prescriptions for youths in England in 8 years – Dec 2019
- Vitamin D levels continue to rise in the US - April 2019
- Iranian low vitamin D levels have been increasing – April 2019
- Vitamin D levels at Mayo Clinic increased over a decade – June 2018
- Vitamin D use increased 3.7 X, Omega-3 increased 9 X (US 1999-2012) – JAMA Oct 2016
- Vitamin D supplementation in Ireland - big increase in people with 20-50 nanograms in 20 years – June 2015
- Vitamin D in US children: those having more than 40 ng increased 60 percent (2001-2010) - Dec 2016
- 4 times fewer with vitamin D deficiency in just 4 years ( Connecticut) – March 2016
- 20X increase in vitamin D sold and 36 percent decrease in osteoporosis business in Australia – Nov 2013
Background: Vitamin D is an essential substance for absorption of calcium and phosphorus from intestine so it is vital for muscles and skeletal development. Deficiency of this vitamin is pandemic. The vitamin D status depends on the different factors such as UV exposure, diet, and ecological features of living location, age and gender. The aim of this study was to describe the vitamin D level in different provinces of Iran and to investigate the association between vitamin D status and multiple variables.
Methods: We collected the serum 25(OH)D (Vitamin D) level data of 308,005 people referred to different laboratories from 30 provinces of Iran and organized them by each province, year, age, gender, precipitation, latitude and longitude, and humidity over 10 yr (2009-2018). Data were analyzed to find out the correlation between age, gender, longitude and latitude, humidity and sum of precipitation.
Results: West Azerbaijan had the highest level of vitamin D with a mean level of 33.24 and a standard deviation of 32.001, and North Khorasan had the lowest level with a mean level of 14.46 and a standard deviation of 8.980 among 30 provinces of Iran. The correlation between all studied variables (age, and gender, latitude and longitude, humidity, the sum of precipitation) was significant (P<0.001).
Conclusion: The average total vitamin D level in Iran is 25.41 ng/ml, which is within the area of deficiency. Vitamin D is associated with age, and gender, latitude and longitude, humidity, the sum of precipitation. So changes in any of these variables can lead to vitamin D alteration.