PRAL of whey proteins - high/low?

[Mike]

Hey all,

I'm trying to determine whether or not a protein supplement
such as your typical whey protein has a negative impact on
skeletal density. So far all I've determined is that it's
the potential renal acid load which is important for
determining if something is going to cause calcium leaching
- is this right?

Assuming it is right, can anyone give me an idea of whether
the PRAL of whey protein is high or low? That's a pretty vague
question, I realise, but it's about as in-depth as I can get
on this subject. I did some web searches, but I was quite
surprised - searches with PRAL or potential renal acid load
along with "whey" throw back such short lists of results that
you'd think I was back on the Internet in 93.. Google gave me
3 results for one of my searches - I thought the connection
had timed out, but it was actually done.

And while I have your attention, are there any general
textbooks on nutrition that get a recommendation?

thanks, Mike

[William Br]

In article <567f0a34.0212041102.245dae08@posting.google.com>,
michael.owen@hushmail.com (Mike) wrote:

> Hey all,
>
> I'm trying to determine whether or not a protein supplement
> such as your typical whey protein has a negative impact on
> skeletal density.

There is no reason it should and some data that suggests
it may help.

> So far all I've determined is that it's the potential renal
> acid load which is important for determining if something is
> going to cause calcium leaching - is this right?

It's not quite that simple no.

>
> Assuming it is right, can anyone give me an idea of whether
> the PRAL of whey protein is high or low? That's a pretty
> vague question, I realise, but it's about as in-depth as I
> can get on this subject. I did some web searches, but I was
> quite surprised - searches with PRAL or potential renal acid
> load along with "whey" throw back such short lists of
> results that you'd think I was back on the Internet in 93..
> Google gave me 3 results for one of my searches - I thought
> the connection had timed out, but it was actually done.
>
> And while I have your attention, are there any general
> textbooks on nutrition that get a recommendation?
>
> thanks, Mike

--
Will Brink

http://www.brinkzone.com/ http://www.aboutsupplements.com/

[Mike]

William Brink <wbrink@*remove*earthlink.net> wrote in message
news:<wbrink-6097EE.12392212122002@nnrp05.earthlink.net>...
> In article
> <567f0a34.0212041102.245dae08@posting.google.com>,
> michael.owen@hushmail.com (Mike) wrote:
>
> > Hey all,
> >
> > I'm trying to determine whether or not a protein
> > supplement such as your typical whey protein has a
> > negative impact on skeletal density.
>
> There is no reason it should and some data that suggests it
> may help.

Interesting - do you have any links or references?

> > So far all I've determined is that it's the potential
> > renal acid load which is important for determining if
> > something is going to cause calcium leaching - is this
> > right?
>
> It's not quite that simple no.

Fair enough. The only thing I've found so far is a page which
listed whey-derived products as having a low PRAL - not
negative like fruits and veg, but still quite low compared to
meats. So I'm not worrying about it, but I'd still like to
know more if anyone has any pages to throw my way.

cheers, Mike

[Myparadox]

michael.owen@hushmail.com (Mike) wrote in message
news:<567f0a34.0212121604.6c3f737d@posting.google.com>...
> William Brink <wbrink@*remove*earthlink.net> wrote in
> message
> news:<wbrink-6097EE.12392212122002@nnrp05.earthlink.net>...
> > In article
> > <567f0a34.0212041102.245dae08@posting.google.com>,
> > michael.owen@hushmail.com (Mike) wrote:
> >
> > > Hey all,
> > >
> > > I'm trying to determine whether or not a protein
> > > supplement such as your typical whey protein has a
> > > negative impact on skeletal density.
> >
> > There is no reason it should and some data that suggests
> > it may help.
>
> Interesting - do you have any links or references?
>
> > > So far all I've determined is that it's the potential
> > > renal acid load which is important for determining if
> > > something is going to cause calcium leaching - is this
> > > right?
> >
> > It's not quite that simple no.
>
> Fair enough. The only thing I've found so far is a page
> which listed whey-derived products as having a low PRAL
> - not negative like fruits and veg, but still quite low
> compared to meats. So I'm not worrying about it, but
> I'd still like to know more if anyone has any pages to
> throw my way.
>
> cheers, Mike

Good questions:1)effects of high protein on ca leaching
2)why are their no studies? Because the problem with
scientific research is that funding is scarce, and when it
comes to diet research where do you begin. But it would be
an easy study to do!

As far as I know, ketogenic amino acids have the effect you
are talking about. By ionizing Ca2+, serum proteins do not
bind it, and then gets excreted. However the primary
circulating excess amino acid, alanine, and the primary amino
acid secreted into the blood by the kidney is
serine-ketogenic. I suppose what I am saying is, it would be
more significant to consider the g/kg/d of total protein that
you are consuming rather than any one foodstuff. If this
amount is more than 1
g/kg/d I would drink more water, take a Ca supplement, or cut
back on whey or other protein like beefjerky as high salty
foods have the same effect at reducing Ca reabsorption at
the nephron. If I had diabetes or renal disease or
osteoporosis in my family genes, my goal for protein would
be 0.2-0.4g/kg/d.

Cheers, myparadox