protein and bone health 
JC73
12 y
1,655
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Trying to figure what amount and type of protein are good/bad for bone health.studies are hard to understand....can you boil down what they mean in practical terms.
J Nutr. 1998 Jun;128(6):1051-3.
Excess dietary protein can adversely affect bone.
Barzel US, Massey LK.
Source
Division of Endocrinology and Metabolism, Department of Medicine, Montefiore Medical Center and The Albert Einstein College of Medicine, Bronx, NY 10467, USA.
Abstract
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.
- Re: protein and bone health JC73
12 y
1,647
Lugol’s Iodine Free S&H
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This is a reply to # 1,946,461What does all this mean?
J Nutr. 2003 Mar;133(3):862S-865S.
Dietary animal and plant protein and human bone health: a whole foods approach.
Massey LK.
Source
Food Science and Human Nutrition, Washington State University Spokane, 99210, USA. massey@wsu.edu
Abstract
Urinary calcium excretion is strongly related to net renal acid excretion. The catabolism of dietary protein generates ammonium ion and sulfates from sulfur-containing amino acids. Bone citrate and carbonate are mobilized to neutralize these acids, so urinary calcium increases when dietary protein increases. Common plant proteins such as soy, corn, wheat and rice have similar total S per g of protein as eggs, milk and muscle from meat, poultry and fish. Therefore increasing intake of purified proteins from either animal or plant sources similarly increases urinary calcium. The effects of a protein on urinary calcium and bone metabolism are modified by other nutrients found in that protein food source. For example, the high amount of calcium in milk compensates for urinary calcium losses generated by milk protein. Similarly, the high potassium levels of plant protein foods, such as legumes and grains, will decrease urinary calcium. The hypocalciuric effect of the high phosphate associated with the amino acids of meat at least partially offsets the hypercalciuric effect of the protein. Other food and dietary constituents such as vitamin D, isoflavones in soy, caffeine and added salt also have effects on bone health. Many of these other components are considered in the potential renal acid load of a food or diet, which predicts its effect on urinary acid and thus calcium. "Excess" dietary protein from either animal or plant proteins may be detrimental to bone health, but its effect will be modified by other nutrients in the food and total diet.
- Re: protein and bone health Hveragerthi
12 y
1,749
Lugol’s Iodine Free S&H
J.Crow’s® Lugol’s Iodine Solution. Restore lost reserves.
Feel Vibrant Again!
My skin glows with youth!
This is a reply to # 1,946,464What does all this mean?
J Nutr. 2003 Mar;133(3):862S-865S.
Dietary animal and plant protein and human bone health: a whole foods approach.
Again they are reading in to a lot of things that are not there. For example, they mention soy, corn, wheat and rice having the same sulfur content as some animal proteins leading to bone loss. But they leave out other factors such as the high level of phytoestrogens found in some of these plants that have been shown to inhibit bone loss.
On the other hand they claim the calcium from milk helps to buffer the acidity from the proteins in milk preventing bone loss. There are several flaws with this claim. First of all calcium absorption is blocked by protein. This is why milk is such as poor source of calcium. Just because it is high in calcium this does not mean it is absorbable. This is akin to swallowing ball bearings to get your iron. Milk is high in phosphorus though, which is the previous study by this same person claimed was acidic and caused bone breakdown. Unlike the calcium, phosphorus absorption is not inhibited by protein.
- Re: protein and bone health Hveragerthi
12 y
1,749
- Re: protein and bone health Hveragerthi
12 y
1,754
Lugol’s Iodine Free S&H
J.Crow’s® Lugol’s Iodine Solution. Restore lost reserves.
Feel Vibrant Again!
My skin glows with youth!
This is a reply to # 1,946,461Trying to figure what amount and type of protein are good/bad for bone health.studies are hard to understand....can you boil down what they mean in practical terms.
The study is very misleading overall. Let's start with what they are claiming. In short they are saying that foods such as animal proteins will cause excess acidity leading to bone demineralization. But this can be buffered with foods high in alkaline minerals like potassium such as fruits and vegetables, or with mineral salts.
The first problem with this claim is that diet has very little direct influence on blood pH. I have addressed this several times in the past. But the primary means of pH regulation in the body is from respiration. And there are many other pH regulators. So buffering by bone minerals is a last resort by the body.
Secondly, the make mention of phosphates as an acid. Excess phosphorus can lead to bone loss, but this is not due to an acidity. Excess phosphorus stimulates parathyroid hormone release, which in turn releases calcium from the bone to maintain calcium homeostasis in the blood.
And they mention mineral salts. Sodium chloride is a mineral salt that has been shown to cause bone loss in excess despite having the alkaline sodium.
Bottom line is that they reading in to a lot of things that are not there.
- Re: protein and bone health JC73
12 y
1,647
