Quote:
Originally Posted by quietone
In March 2007, a group of vitamin D and nutrition researchers published a controversial and provocative editorial contending that the desirable concentration of 25(OH)D is ≥30 ng/mL (≥75 nmol/L) [12]. They noted that supplemental intakes of 400 IU/day of vitamin D increase 25(OH)D concentrations by only 2.8-4.8 ng/mL (7-12 nmol/L) and that daily intakes of approximately 1,700 IU are needed to raise these concentrations from 20 to 32 ng/mL (50 to 80 nmol/L).
Comment: The optimum level
|
They may well have done but it is now known that your body
does not even start to store Vitamin d3 until circulating 25(OH)D is above 50ng 125nmol/l. We have known for a long time that the human body
seems to use between 3000-5000iu/daily.
While it is true that 80nmol/l 32ng will enable most (but not all) people to absorb the optimal amount of calcium from their diet that is only one aspect of the role of vitamin d3. There are some 900+ Vitamin D receptors controlling well over 200gene reactions. Now we know the body isn't satisfied it can safely put spare vitamin d into storage untill after all it's daily basic needs have been met it seems dangerously misguided to adopt a lower than ideal level as the standard.
Wouldn't a better level be the vitamin d status that actually allowed breast milk to flow replete with vitamin d3?
I should also like to correct the idea that 1700iu is sufficient to raise status from 50-80nmol/l. That may work in the USA where there are more days of UVB available and more hours sunshine daily and milk is fortified and cereals also may be. In the UK (further north, cloudy island no milk fortification) it is more likely the oral dose of vitamin D3 to attain and maintain 25(OH)D levels >80 nmol/L is 2200 IU/d if baseline levels are the average UK adult winter status of 20 to 40 nmol/L.
Remember also that 80nmol/l is only first base.
You won't find any vit d in breast milk at that low level.
You won't have any spare Vit d to store for emergency use.
You won't have the level of protection necessary to protect from breast colon and other cancers. Why settle for than when for a trivial amount more money you can attain a level
known to improve feelings of wellbeing.
You can get a
home blood spot vitamin d test here if you really don't believe you are vitamin D insufficient.
I live in the UK. I take 5000iu/daily I also take every possible opportunity to get as much full body sun exposure as I can. Even so my 25(OH)D has never yet reached 60ng 150nmol/l although it has almost reached that level at 147.5nmol/l. I really don't believe that for folks living in the UK using amounts of vit d 2000IU or less will prove satisfactory. Imagine anyone suggesting that half the calorie intake for someone your height/weight/activity level was absolutely fine. Would your body still remain hungry for more?
It is only when your basic daily needs have been met in full that your body can save. Think of your savings bank account. While your daily income remains less than your daily expenditure can you possibly save?