Tue, Jun-30-09, 11:11
|
|
Finding the Pieces
Posts: 17,049
|
|
Plan: Mishmash
Stats: 365/308.0/185
BF:
Progress: 32%
Location: Maryland, US
|
|
Quote:
|
Originally Posted by Zuleikaa
Lere
You are talking apples and oranges. You are correct that sunscreen use won't affect the current serum concentrations of concentrations of vitamin D. That's not the point. That level of vitamin D is already in the system.
What sunscreen does is prevent up to 95% of vitamin D generation through the skin. And that means though you have vitamin D in your system, you won't add to it or replace the amount you use up which leads to depletion and deficiency.
Ah, and the use of suncreen did decrease 25-hydroxvitamin D levels...just not enough to induce secondary hyperparthyroidism.
Those of us here know that levels required to ensure parathyroid function are very low and easily corrected...much higher levels are required for preventive and optimum health.
And regards the nursing home residents...do you have that cite?
I'm assuming if they were 100+, they grew up in a much less modern era and were probably vitamin D replete growing up. Add to that organic produce, physical labor, outside work, Mediterranean environment, etc. and I'm not surprised at their longevity and health.
|
Oh and your quote from the Italians in the nursing home. Here's what Dr. Cannell had to say:
The Vitamin D Newsletter February 2007go to newsletter archivesTransmission of InfluenzaTime for some continuing education with another vitamin D quiz!...
People can reach 100 years of age without any vitamin D in their blood.
6 False True True. When researchers went to an Italian nursing home, they found that 99 of 104 residents had no detectable vitamin D in their blood, yet all of the 104 resident were over 98 years old? The keyword here is "can"the study said nothing about what the residents' vitamin D blood levels were prior to their arrival at the nursing home. A recent large study showed good evidence that low levels are not only associated with going into nursing homes, but dying as well. Passeri G, et al. Low vitamin D status, high bone turnover, and bone fractures in centenarians. J Clin Endocrinol Metab. 2003 Nov;88(11):510915. Visser M, et al. Low serum concentrations of 25-hydroxyvitamin D in older persons and the risk of nursing home admission. Am J Clin Nutr. 2006 Sep;84(3):61622; quiz 6712.
Not good sportsmanship to cherry pick, but understandable. Not at all kosher to omit the entire story.
|