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Africa category listing hasTable of contents
- Traditionally living populations in East Africa have a mean serum 25-hydroxyvitamin D concentration of 115 nmol/l.
- 43 nanograms, Pregnant Maasai 59 nanograms
- Traditionally living populations in East Africa have a mean serum 25-hydroxyvitamin D concentration of 119 nmol/l.
- Vitamin D status indicators in indigenous populations in East Africa.
- See also VitaminDWiki
Traditionally living populations in East Africa have a mean serum 25-hydroxyvitamin D concentration of 115 nmol/l.
Br J Nutr. 2012 Jan 23:1-5.
Luxwolda MF, Kuipers RS, Kema IP, Janneke Dijck-Brouwer DA, Muskiet FA.
Laboratory Medicine, University Medical Center Groningen (UMCG), PO Box 30.001, 9700 RB, Groningen, The Netherlands.
Cutaneous synthesis of vitamin D by exposure to UVB is the principal source of vitamin D in the human body. Our current clothing habits and reduced time spent outdoors put us at risk of many insufficiency-related diseases that are associated with calcaemic and non-calcaemic functions of vitamin D. Populations with traditional lifestyles having lifelong, year-round exposure to tropical sunlight might provide us with information on optimal vitamin D status from an evolutionary perspective.
We measured the sum of serum 25-hydroxyvitamin D2 and D3 (25(OH)D) concentrations of thirty-five pastoral Maasai (34 (sd 10) years, 43 % male) and twenty-five Hadzabe hunter-gatherers (35 (sd 12) years, 84 % male) living in Tanzania.
They have
- skin type VI, have a
- moderate degree of clothing,
- spend the major part of the day outdoors, but
- avoid direct exposure to sunlight when possible.
Their 25(OH)D concentrations were measured by liquid chromatography-MS/MS.
The mean serum 25(OH)D concentrations of Maasai and Hadzabe were 119 (range 58-167) and 109 (range 71-171) nmol/l, respectively.
These concentrations were not related to age, sex or BMI.
People with traditional lifestyles, living in the cradle of mankind, have a mean circulating 25(OH)D concentration of 115 nmol/l.
Whether this concentration is optimal under the conditions of the current Western lifestyle is uncertain, and should as a possible target be investigated with concomitant appreciation of other important factors in Ca homeostasis that we have changed since the agricultural revolution.
PMID: 22264449
43 nanograms, Pregnant Maasai 59 nanograms
Vitamin D status indicators in indigenous populations in East Africa.
Eur J Nutr. 2012 Aug 10.
Luxwolda MF, Kuipers RS, Kema IP, van der Veer E, Dijck-Brouwer DA, Muskiet FA.
Laboratory Medicine, Room Y 3.181, University Medical Center Groningen (UMCG), P.O. Box 30.001, 9700 RB, Groningen, The Netherlands, mfluxwolda at hotmail.com.
PURPOSE: Sufficient vitamin D status may be defined as the evolutionary established circulating 25-hydroxyvitamin D [25(OH)D] matching our Paleolithic genome.
METHODS: We studied serum 25(OH)D [defined as 25(OH)D(2) + 25(OH)D(3)] and its determinants in 5 East African ethnical groups across the life cycle: Maasai (MA) and Hadzabe (HA) with traditional life styles and low fish intakes, and people from Same (SA; intermediate fish), Sengerema (SE; high fish), and Ukerewe (UK; high fish). Samples derived from non-pregnant adults (MA, HA, SE), pregnant women (MA, SA, SE), mother-infant couples at delivery (UK), infants at delivery and their lactating mothers at 3 days (MA, SA, SE), and lactating mothers at 3 months postpartum (SA, SE). Erythrocyte docosahexaenoic acid (RBC-DHA) was determined as a proxy for fish intake.
RESULTS: The mean ± SD 25(OH)D of non-pregnant adults and cord serum were 106.8 ± 28.4 and 79.9 ± 26.4 nmol/L, respectively. Pregnancy, delivery, ethnicity (which we used as a proxy for sunlight exposure), RBC-DHA, and age were the determinants of 25(OH)D. 25(OH)D increased slightly with age. RBC-DHA was positively related to 25(OH)D, notably 25(OH)D(2). Pregnant MA (147.7 vs. 118.3) and SE (141.9 vs. 89.0) had higher 25(OH)D than non-pregnant counterparts (MA, SE). Infant 25(OH)D at delivery in Ukerewe was about 65 % of maternal 25(OH)D.
CONCLUSIONS: Our ancient 25(OH)D amounted to about 115 nmol/L and sunlight exposure, rather than fish intake, was the principal determinant. The fetoplacental unit was exposed to high 25(OH)D, possibly by maternal vitamin D mobilization from adipose tissue, reduced insulin sensitivity, trapping by vitamin D-binding protein, diminished deactivation, or some combination.
PMID: 22878781
Traditionally living populations in East Africa have a mean serum 25-hydroxyvitamin D concentration of 119 nmol/l.
Br J Nutr. 2012 Nov 14;108(9):1557-61. doi: 10.1017/S0007114511007161. Epub 2012 Jan 23.
Luxwolda MF, Kuipers RS, Kema IP, Dijck-Brouwer DA, Muskiet FA.
Laboratory Medicine, University Medical Center Groningen, Groningen, The Netherlands. m.luxwolda at umcg.nl
Cutaneous synthesis of vitamin D by exposure to UVB is the principal source of vitamin D in the human body. Our current clothing habits and reduced time spent outdoors put us at risk of many insufficiency-related diseases that are associated with calcaemic and non-calcaemic functions of vitamin D. Populations with traditional lifestyles having lifelong, year-round exposure to tropical sunlight might provide us with information on optimal vitamin D status from an evolutionary perspective. We measured the sum of serum 25-hydroxyvitamin D₂ and D₃ (25(OH)D) concentrations of thirty-five pastoral Maasai (34 (SD 10) years, 43 % male) and twenty-five Hadzabe hunter-gatherers (35 (SD 12) years, 84 % male) living in Tanzania.
They have skin type VI, have a moderate degree of clothing, spend the major part of the day outdoors, but avoid direct exposure to sunlight when possible.
Their 25(OH)D concentrations were measured by liquid chromatography-MS/MS. The mean serum 25(OH)D concentrations of Maasai and Hadzabe were 119 (range 58-167) and 109 (range 71-171) nmol/l, respectively. These concentrations were not related to age, sex or BMI. People with traditional lifestyles, living in the cradle of mankind, have a mean circulating 25(OH)D concentration of 115 nmol/l. Whether this concentration is optimal under the conditions of the current Western lifestyle is uncertain, and should as a possible target be investigated with concomitant appreciation of other important factors in Ca homeostasis that we have changed since the agricultural revolution.
PMID: 22264449
Vitamin D status indicators in indigenous populations in East Africa.
Eur J Nutr. 2013 Apr;52(3):1115-25. doi: 10.1007/s00394-012-0421-6. Epub 2012 Aug 10.
Luxwolda MF, Kuipers RS, Kema IP, van der Veer E, Dijck-Brouwer DA, Muskiet FA.
Laboratory Medicine, Room Y 3.181, University Medical Center Groningen (UMCG), P.O. Box 30.001, 9700 RB, Groningen, The Netherlands. mfluxwolda at hotmail.com
PURPOSE: Sufficient vitamin D status may be defined as the evolutionary established circulating 25-hydroxyvitamin D 25(OH)D matching our Paleolithic genome.
METHODS: We studied serum 25(OH)D [defined as 25(OH)D₂ + 25(OH)D₃] and its determinants in 5 East African ethnical groups across the life cycle: Maasai (MA) and Hadzabe (HA) with traditional life styles and low fish intakes, and people from Same (SA; intermediate fish), Sengerema (SE; high fish), and Ukerewe (UK; high fish). Samples derived from non-pregnant adults (MA, HA, SE), pregnant women (MA, SA, SE), mother-infant couples at delivery (UK), infants at delivery and their lactating mothers at 3 days (MA, SA, SE), and lactating mothers at 3 months postpartum (SA, SE). Erythrocyte docosahexaenoic acid (RBC-DHA) was determined as a proxy for fish intake.
RESULTS: The mean ± SD 25(OH)D of non-pregnant adults and cord serum were 106.8 ± 28.4 and 79.9 ± 26.4 nmol/L, respectively. Pregnancy, delivery, ethnicity (which we used as a proxy for sunlight exposure), RBC-DHA, and age were the determinants of 25(OH)D. 25(OH)D increased slightly with age. RBC-DHA was positively related to 25(OH)D, notably 25(OH)D₂. Pregnant MA (147.7 vs. 118.3) and SE (141.9 vs. 89.0) had higher 25(OH)D than non-pregnant counterparts (MA, SE). Infant 25(OH)D at delivery in Ukerewe was about 65 % of maternal 25(OH)D.
CONCLUSIONS: Our ancient 25(OH)D amounted to about 115 nmol/L and sunlight exposure, rather than fish intake, was the principal determinant. The fetoplacental unit was exposed to high 25(OH)D, possibly by maternal vitamin D mobilization from adipose tissue, reduced insulin sensitivity, trapping by vitamin D-binding protein, diminished deactivation, or some combination.
PMID: 22878781
Note by VitaminDWiki: Lighted skinned people appear to need more vitamin D than dark skinned.
Many articles have indicated that dark skinned people have adapted to having a lower level of serum vitamin D.
See also VitaminDWiki
- Hawaiians with lots of sunlight had 51 ng of vitamin D – July 2011
- Is 50 ng of vitamin D too high, just right, or not enough
- Overview Dark Skin and Vitamin D
- Dark Skinned adults need more than 45 minutes of UK summer sun daily – June 2013
- Nigerian albinos have vitamin D levels of 96 ng – Oct 2019
- Native women in East Africa have a good level of vitamin D (40 ng) – April 2013 Luxwolda - with chart
- Black women and vitamin D: Nigeria 26 ng, Chicago 12 ng – April 2013
- Forearm fracture 3.5X more often in black children with low levels of vitamin D – Sept 2012
- Skin color and vitamin D – Jablonski – Spring 2012
- Vitamin D levels of East African tribes
- Chart of Vitamin D levels vs race - April 2013 has the following chart
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