Скачать или смотреть VITAMIN D Helps Create Stronger Bones and Prevents Fractures!

In this video, Dr. Brown explains everything you need to know about vitamin D and how it actually does prevent fractures and is good for your overall bone health!

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Transcription:
hi everybody this is dr. Susan Brown
director of the center for better bones
today I want to talk to you about
vitamin D and I want to tell you don't
be fooled vitamin D does prevent
fracture you might have seen a recent
headline saying big research projects
suggest that vitamin D doesn't prevent
fracture I'm going to talk to you I'm
going to show you why that is not an
accurate representation why that study
as a whole was not valent so let me
first say I spent thirty years looking
at how to maximize bone health spend a
lot of time looking at vitamin D
actually in 2008 I wrote this article on
vitamin D in fracture prevention and we
looked at several of the really
excellent studies that showed vitamin D
if one takes it to the therapeutic level
in other words to an effective level
reduces fracture by about 50% and in
fact in this very same article many
other scholars are reported who agree
with that same estimation so you might
say gee susan is saying this reduces
fracture by 50% how does dr. bollen
there in New Zealand say that it doesn't
reduce fracture now the problem here is
the type of analysis the type of
analysis that these researchers use the
researchers who say vitamin D is not
effective and what they do is what is
called a meta analysis and a meta
analysis is an overall analysis of all
the studies so these people got together
80 different studies on vitamin D for
example this latest study which was from
New Zealand and published by dr. bollen
in Lancet just a few weeks ago they
looked at many many studies on vitamin D
and they look at the results of these
studies and try to summarize what the
overall outcome would be looking at for
example 80 different studies now the
problem is that these 80 studies were
done over many years and the vast
majority
of them those studies themselves were
flawed if you look carefully at this
work you'll see the dose of vitamin D
used was often four hundred eight
hundred units which we know is simply
not enough even more there's five
specific issues you should look at when
you're assessing the the validity of
studies on vitamin D and I'm going to
list those five things for you just in
one minute I'm going to show you how the
study that's making headlines saying
vitamin D doesn't prevent fracture does
not follow the necessary criteria to
allow them to say that so what are the
five things that you need to know when
you look at a vitamin D study whether
it's one study or whether it's 80
studies put together you need to know
the size of the population many of these
studies that they did the studies were
too small to really make any valid
suggestions fractures don't occur often
you need a large population to detect
that number too often these studies were
too short duration as you know it
generally takes two years to see a bone
density change on bone density machine
so you can't do these studies in a short
period of time number three and most
importantly to me is that to be accurate
a study of vitamin D must not only
document how much the person is given
but if the person reached the
therapeutic threshold we know for
example from the work of dr. Robert
Heaney and others you need at least a
thirty to ng of vitamin D in the blood
level that is to guarantee you're going
to have good calcium absorption and this
is known as an effective dose of vitamin
D for fracture prevention thirty-two in
these studies many many of these studies
mentioned in the current