Low-carbohydrate, High-protein Diet Delivers Marked Acid Load to Kidneys

[Guest guest]

Low-carbohydrate, High-protein Diet Delivers a Marked Acid Load to

the Kidney JoAnn Guest

Jan 23, 2007 09:40 PST

 

--

January 23, European Urology Advanced

Overactive Bladder (OAB)

Stress Urinary Incontinence (SUI)

 

 

Low-carbohydrate, High-protein Diet Delivers a Marked Acid Load to

the Kidney

NEW YORK (Reuters Health) - Consumption of a low-carbohydrate,

high-protein (LCHP) diet delivers an exaggerated acid load to the

kidney, increasing the risk for kidney stone formation and possibly

for bone loss, according to results of a study published in the

August issue of the American Journal of Kidney Diseases. NEW YORK

(Reuters Health) -

 

Consumption of a low-carbohydrate, high-protein (LCHP) diet delivers

an exaggerated acid load to the kidney, increasing the risk for

kidney stone formation and possibly for bone loss, according to

results of a study published in the August issue of the American

Journal of Kidney

Diseases.

 

Dr. Shalini T. Reddy, of the University of Chicago, Illinois, and

colleagues examined the association between LCHP diets and acid-base

balance, kidney stone risk, and calcium and bone metabolism in 10

healthy patients enrolled in a metabolic study.

 

Consumption of their usual non-weight-reducing diet was followed

for 2 weeks by a severely carbohydrate-restricted induction diet and

then 4 weeks of a moderately carbohydrate-restricted maintenance

diet.

 

The researchers observed a decrease in urine pH from 6.09 at

baseline to 5.56 (p < 0.01) at the induction stage and 5.67 (p <

0.05) at the maintenance stage. There was an increase in net acid

excretion from a baseline of 61 mEq/d to 116 mEq/d (p < 0.001) at

induction and 112 mEq/d

(p < 0.001) at maintenance. Urinary citrate levels decreased from

763

mg/d at baseline to 449 mg/d (p < 0.01) and 581 mg/d (p < 0.05) at

the induction and maintenance phases, respectively.

 

There was a more than twofold increase in urinary saturation of

undissociated uric acid, according to the team. There was an

increase in

urinary calcium levels from 160 mg/d to 258 mg/d (p < 0.001) to 248

mg/d (p < 0.01).

 

" This increase in urinary calcium levels was not compensated by a

commensurate increase in fractional intestinal calcium absorption, "

the investigators note.

 

" Therefore, estimated calcium balance decreased by 130 mg/d (p <

0.001) and 90 mg/d (p < 0.05). "

 

While urinary deoxypyridinoline and N-telopeptide levels trended

upward, there was a significant decrease (p < 0.01) in

concentrations of serum osteocalcin (from 5.7 ng/mL to 4.8 ng/mL to

5.0 ng/mL).

 

" Although people who follow high-protein, low-carbohydrate diets

lose weight, they should be aware of the risk of kidney stone

formation and

the potential for long-term osteoporosis, "

Dr. Reddy cautioned in an interview with Reuters.

 

" Patients with a personal history of kidney

stones or a family history of kidney stones should not follow these

diets, " he added.

 

Am J Kidney Dis 2002;40:265-274.

 

http://www.urotoday.com/browse_categories/urolithiasis/lowcarbohydrat

e_highprotein_diet_delivers_a_marked_acid_load_to_the_kidney.html

 

 

 

 

 

 

 

 

 

JoAnn Guest

mrsjo-

www.geocities.com/mrsjoguest/Diets

[Guest guest]

A high-protein high-fiber diet that is good for you however would

include instead of meat, high-protein undenatured whey, which is

actually alkalizing and produces no acidic kidney loading.

 

 

Bonnie.

 

 

, " JoAnn Guest "

<angelprincessjo wrote:

>

> Low-carbohydrate, High-protein Diet Delivers a Marked Acid Load to

> the Kidney JoAnn Guest

> Jan 23, 2007 09:40 PST

>

> --

> January 23, European Urology Advanced

> Overactive Bladder (OAB)

> Stress Urinary Incontinence (SUI)

>

>

> Low-carbohydrate, High-protein Diet Delivers a Marked Acid Load to

> the Kidney

> NEW YORK (Reuters Health) - Consumption of a low-carbohydrate,

> high-protein (LCHP) diet delivers an exaggerated acid load to the

> kidney, increasing the risk for kidney stone formation and