Re: Acid-base diet

On Fri, 01 Jul 2005 17:07:46 -0400, Susan wrote in
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Quoted message said:

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Enrico C said:

I am trying to understand if there is some truth in the acid-base diet
theory. I've been reading different opinions on the net.

Anyway, I see there are studies on Pubnet about acid-base balance in diet.
What do you make of this article, for instance?

It's been disproven many times over.

You mean the content of that article has been disproven?

Quoted message said:

http://www.nutrition.org/cgi/content/full/128/6/1051
The Journal of Nutrition Vol. 128 No. 6 June 1998, pp. 1051-1053
Excess Dietary Protein Can Adversely Affect Bone1,2

Uriel S. Barzel3 and Linda K. Massey*, 4

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Enrico C said:

You mean the content of that article has been disproven?

Sorry, I'm in severe dental pain, and am not taking time with my posts.

The assertions about the impacts of protein have been rebutted by quite
a few studies.

Susan

On Fri, 01 Jul 2005 18:25:44 -0400, Susan wrote in
<news:[email hidden]> on
sci.med.nutrition,sci.bio.food-science :

Quoted message said:

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Enrico C said:

You mean the content of that article has been disproven?

Sorry, I'm in severe dental pain, and am not taking time with my posts.

No probl 🙂

Quoted message said:

The assertions about the impacts of protein have been rebutted by quite
a few studies.

Well, I agree that's an hypothetis, not a "fact".
Yet, it seems to me some recent studies confirm it...

Here is one, for instance...

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=15691900&query_hl=9
J Appl Physiol. 2005 Feb 3; [Epub ahead of print]

Amino acid supplementation alters bone metabolism during simulated
weightlessness.

Zwart SR, Davis-Street JE, Paddon-Jones D, Ferrando AA, Wolfe RR, Smith SM.

Human Adaptation and Countermeasures, NASA Johnson Space Center, Houston,
TX, USA.

High-protein and acidogenic diets induce hypercalciuria. Foods or
supplements with excess sulfur-containing amino acids increase endogenous
sulfuric acid production, and therefore have the potential to increase
calcium excretion and alter bone metabolism. In this study, effects of an
amino acid/carbohydrate supplement on bone resorption were examined during
bed rest. Thirteen subjects were divided at random into 2 groups: a control
group (CON, n = 6) and an amino acid/carbohydrate supplemented group (AA, n
= 7) who consumed an extra 49.5 g essential amino acids and 90 g
carbohydrate per day for 28 d. Urine was collected for ntelopeptide (NTX),
deoxypyridinoline (DPD), calcium, and pH determinations. Bone mineral
content (BMC) was determined and potential renal acid load (PRAL) was
calculated. Bonespecific alkaline phosphatase (BSAP) was measured in serum
samples collected on day 1 (immediately before bed rest) and on day 28.
PRAL was higher in the AA group than in the CON group during bed rest (P <
0.05). For all subjects, during bed rest urinary NTX and DPD concentrations
were greater than pre-bed rest levels (P < 0.05). Urinary NTX and DPD
tended to be higher in the AA group (P = 0.073 and P = 0.056,
respectively). During bed rest, urinary calcium was greater than baseline
levels (P < 0.05) in the AA group but not the CON group. Total BMC was
lower after bed rest than before bed rest in the AA group but not the CON
group (P < 0.05). During bed rest, urinary pH decreased (P < 0.05), and was
lower in the AA group than the CON group. These data suggest that bone
resorption increased, without changes in bone formation, in the AA group.

PMID: 15691900 [PubMed - as supplied by publisher]

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