Actually i just watch this talk of harvard mdical school and get a headache by this talk. I hope someone can sum it up.
What do you understand from this talk? And what are the positions on Vitamin D? Is there anything new or special found in this talk?
http://www.youtube.com/watch?v=Nex84PAjHU4&feature=BFa&list=PL899702E77C72BA38&l Boosting Vitamin D: Not Enough or Too Much? - Harvard School of Public Health
A vital issue with vitamin d is the ability of the body to convert the inactive form to the active form. It is impaired by many things. Inflammation does it, and so does a magnesium insufficiency. http://wholehealthsource.blogspot.com/2010/04/magnesium-and-vitamin-d-metabolism.html Testing levels of the inactive form only doesn't really tell us what our active vitamin d status is, it isn't a great measurement of the efficacy of vitamin d, you could have high levels and low signaling to the vitamin d receptor, and yet everyone is obsessing over the 25-hydroxy vitamin D. A very low level is obviously bad regardless, but without sufficient magnesium which the general population is wildly deficient in there may be little benefit to higher vitamin d levels. Levels don't entail vitamin d receptor signaling, only sometimes.
So just like with everything else in nutrition science that has ever happened, scientists need to go back and do a new wave of experiments that take magnesium status and other factors into account.
I question supplements and especially ones that the gov't or very popular people (Dr. Mercola) and agencies try to push. Therefore, I don't supplement vit D. If you're concerned then just take cod liver oil. I don't necessarily even trust all the sun exposure recommendations. If melatonin helps turn back the clock, wouldn't it make sense that the sun ages us? Could we be similar to nite shade veggies and our cells prefer the dark? What is mysterious though is I feel sad and depressed with too many grey days. I read once that's because the sun is like a drug to us-- we go thru withdrawals if we don't have it often enough. I would also question the blood tests since who knows what really is our optimal levels of anything. I know these are crazy opinions but just wondering if anyone else has thought of these thoughts. There's supposedly a middle earth (look up Agartha or Agarhta) and the story goes that they once lived on Earth (Atlantians, etc) but when the sun came they soon realized that it was aging them (they're very advanced) and went under ground where there are mountains and similar landscapes (again- look this stuff up!). Could there be a secret society (sun worshipers- Christianity -the sun/son, etc.) that wants us dumbed down and to not live to be a 1000 years old like we once were able? You can call me crazy or look into this yourself-- research deep and you'd be surprised as to what you may find. Of course I could be way off course, but maybe not too!