Once vitamin D is produced in the skin or consumed in food, it is converted in the liver and kidney to form 1,25 dihydroxyvitamin D, (1,25(OH)2D) the physiologically active form of vitamin D. This metabolically active form of vitamin D is known as calcitriol. Following this conversion, calcitriol is released into the circulation, and by binding to a carrier protein in the plasma, vitamin D binding protein (VDBP), it is transported to various target organs.
So why do black people show higher levels of the active form of vitamin d?
Also researchers doing a study on osteoporosis say black women may not need as much vitamin d as white women. The African American population have stronger bones and tend to have greater bone density than other ethnic groups and Caucasians
When one states that a white person synthesizes vit d 6x faster than a black, this only suggests that Europeans require 6x the synthesis of vit d to keep up with/ or maintain a similar bone development that blacks naturally have. 99% of calcium is found in bone. Blacks have the strongest bones in the world. Whites depend on vit d from sunlight to achieve a similar bone structure to that of blacks. Let me re-emphasize the word similar to point out that although Caucasians can produce vit d 6x faster than blacks, whites still have the weakest bones in the world. in redundancy, whites require 6x more vit d than blacks (6:1 ratio) to maintain an adequate skeletal anatomy similar to that of blacks. Furthermore, one does not find / or diagnose rickets in adult black people. If you remember, rickets only occur in children. rickets, unequivocally, is a child's deficiency.
The essential function of vit d is for maintaining calcium metabolism and the maintenance of bone densities. Metabolic levels within a specific range is also vital for normal functioning of the nervous system. whites have more genetic defects of the nervous system and bone-density crisis than do blacks. Although whites can produce vit d faster than blacks, obviously this great feat of the... synthesis and biochemical pathways are not enough for their skeletal anatomy. The fact still remains that whites have the weakest bones in the world (let me point out that Caucasians biological systems have a high affinity for photophobia-- whites, like albinos, have a fear of sunlight). To achieve equivalent bone densities to that of blacks requires whites to sit even longer (above the 6x synthesis threshold) in pure sunlight.
while recent studes have linked vitamin D deficiency to a host of major illnesses, cancer, diabetes, cardiovascular, high blood pressure, Some in the medical community say the study isn't conclusive, because it only observed people's levels. There are still QUESTIONS over WHETHER the vitamin REALLY WORKS and IF SO in WHAT DOSAGE.
Harvard University is leading a five year clinical trial to answer some of the lingering questions about vitamin D. Researchers are currently seeking 20,000 older adults
what we do know and have known for decades is that vitamin d is crucial to bone development, and blk ppl have better bone development/health from birth to old age
vitamin d also helps in absorbing calcium, well blks ppl also absorb and retain calcium more efficiently,which also has been known for decades.
question is...how is that possible when we are so viamin d deficient?
let me tell you a little secret...white ppl do not convert vitamin d properly. once vitamin d is synthesized its converted to active form (calcitriol) and transported to various organs called
calcitriol is the hormonally active form of vitamin D with three alcohol groups (abbreviated 1,25-(OH)2D3). It increases the level of calcium in the blood by (1) increasing the uptake of calcium from the gut into the blood,(2) decreasing the transfer of calcium from blood to the urine by the kidney, and (3) increasing the release of calcium into the blood from bone.
And this is why they have weaker bones and are more prone to osteoporosis
because they do not convert vitamin d properly to its active form, synthesizing vitamin d six times faster does no good without being able to convert it
without proper exposure to natural sunlight anyone black or white can be vitamin d deficient.