Osteoporosis, acid based foods, calcium, potassium & alkali bases

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Yes it seems laminal based protein can have a negative effect on bone strength:

 

Full Text HTML:

http://biomed.gerontologyjournals.org/cgi/content/full/55/10/M585

 

Full text PDF:

http://biomed.gerontologyjournals.org/cgi/reprint/55/10/M585.pdf

 

The Journals of Gerontology Series A: Biological Sciences and Medical Sciences

55:M585-M592 (2000)

Worldwide Incidence of Hip Fracture in Elderly Women

Relation to Consumption of Animal and Vegetable Foods

Lynda A. Frassettoa, Karen M. Todda, R. Curtis Morris, Jr.a and Anthony

Sebastiana

a Department of Medicine and General Clinical Research Center, University of

California, San Francisco

Correspondence: Anthony Sebastian, Box 0126, 1202 Moffitt Hospital, University

of California, San Francisco, CA 94143

E-mail: sebastia.

William B. Ershler, MD

 

Background. Hip fracture, a major health problem in elderly persons, varies in

incidence among the populations of

different countries and is directly related to animal protein intake, a finding

that suggests that bone integrity is

compromised by endogenous acid production consequent to the metabolism of animal

proteins. If that is so, vegetable

foods might provide a countervailing effect, because they are a rich source of

base (bicarbonate) in the form of

metabolizable organic anions, which can neutralize protein-derived acid and

supply substrate (carbonate) for bone

formation.

 

Methods. We analyzed reported hip fracture incidence (HFI) data among countries

(N = 33) in women aged 50 years and

older, in relation to corresponding country-specific data on per capita

consumption of vegetable and animal foods as

reported by the United Nations Food and Agriculture Organization.

 

Results. HFI varied directly with total (r = +.67, p < .001) and animal (r =

+.82, p < .001) protein intake and

inversely with vegetable protein intake (r = -.37, p < .04). The countries in

the lowest tertile of HFI (n = 11) had the

lowest animal protein consumption, and invariably, vegetable protein (VP)

consumption exceeded the country's

corresponding intake of animal protein (AP): VP/AP > 1.0. By contrast, among the

countries in the highest tertile of

HFI, animal protein intake exceeded vegetable protein intake in nearly every

case (10 of 11 countries). Among all

countries, HFI correlated inversely and exponentially with the ratio of

vegetable/animal protein intake (r = -.84, p <

..001) and accounted for 70% of the total variation in HFI. Adjusted for total

protein intake, vegetable food consumption

was an independent negative predictor of HFI. All findings were similar for the

subset of 23 countries whose populations

are predominantly Caucasian.

 

Conclusion. The findings suggest that the critical determinant of hip fracture

risk in relation to the acid-base effects

of diet is the net load of acid in the diet, when the intake of both acid and

base precursors is considered. Moderation

of animal food consumption and an increased ratio of vegetable/animal food

consumption may confer a protective effect.

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Interesting that the paper is really about the effect of high acid based foods

on bone and published this list of high

acid foods. I indented the meat foods to make the list have a second dimension.

 

Potential Acid From Methionine and Cystine (mEq/100 g protein)

 

Grapes 71.1

Walnuts 66.5

Rice 65.4

Chicken 58.4

Wheat bread 58.1

Sweet corn 58.1

Salmon 57.5

Cod 57.5

Ham 56.7

Turkey 56.2

Lamb 54.3

Beef 53.0

Brown rice 50.4

Peaches 46.8

Pineapple 46.3

Oranges 46.2

Buckwheat 46.2

Soybeans 44.9

Potatoes 42.5

Bananas 41.8

Apples 40.4

Chickpeas 39.9

Yam 39.1

Cauliflower 38.3

Black beans 38.3

Zucchini 36.9

Kale 35.2

Tomatoes 32.6

Cabbage 26.9

Broccoli 26.5

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Now you need to address the calcium : protein ratio;

 

Excess Dietary Protein May Not Adversely Affect Bone

 

Full text HTML:

http://www.nutrition.org/cgi/content/full/128/6/1054

 

Full text PDF:

http://www.nutrition.org/cgi/reprint/128/6/1054.pdf

 

Which argues that maintaining a calcium : protein ratio of 20 mg calcium : 1 g

protein will eliminate any bone loss from

dietary calcium.

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And then the effect of alkali buffers & potassium

 

Excess Dietary Protein Can Adversely Affect Bone

 

Full text HTML:

http://www.nutrition.org/cgi/content/full/128/6/1051

 

Full text PDF:

http://www.nutrition.org/cgi/content/full/128/6/1051

 

The average American diet, which is high in protein and low in fruits and

vegetables, generates a large amount of acid,

mainly as sulfates and phosphates. The kidneys respond to this dietary acid

challenge with net acid excretion, as well

as ammonium and titratable acid excretion. Concurrently, the skeleton supplies

buffer by active resorption of bone.

Indeed, calciuria is directly related to net acid excretion. Different food

proteins differ greatly in their potential

acid load, and therefore in their acidogenic effect. A diet high in acid-ash

proteins causes excessive calcium loss

because of its acidogenic content. The addition of exogenous buffers, as

chemical salts or as fruits and vegetables, to

a high protein diet results in a less acid urine, a reduction in net acid

excretion, reduced ammonium and titratable

acid excretion, and decreased calciuria. Bone resorption may be halted, and bone

accretion may actually occur. Alkali

buffers, whether chemical salts or dietary fruits and vegetables high in

potassium, reverse acid-induced obligatory

urinary calcium loss. We conclude that excessive dietary protein from foods with

high potential renal acid load

adversely affects bone, unless buffered by the consumption of alkali-rich foods

or supplements.

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So it seems the question of animal protein causing bone loss is actually one of

eating too many acid based foods (which

need not be animal protein!), not enough calcium and not enough potassium /

alkali rich foods. Throw in low Vit D / Vit

K and you have the reason high acid protein foods MAY effect bone strength in a

negative way.

 

Solution, eat the protein source you choose, but get ample amounts of calcium,

alkali bases, potassium, Vit D & K.

 

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Good Health & Long Life,

Greg Watson,

http://www.ozemail.com.au/~gowatson

gowatson