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Protein-induced hypercalciuria

H M Linkswiler, M B Zemel, M Hegsted

    Federation Proceedings
    |July 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    High dietary protein significantly increases urinary calcium loss by reducing kidney reabsorption. Increased phosphorus intake can mitigate these effects, suggesting higher requirements for both minerals with high protein diets.

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    Area of Science:

    • Nutritional Science
    • Renal Physiology
    • Metabolic Balance

    Background:

    • Dietary protein levels critically influence calcium balance and urinary calcium excretion in humans.
    • Existing research indicates a complex interplay between protein, phosphorus, and calcium metabolism.

    Purpose of the Study:

    • To investigate the impact of varying dietary protein intake on urinary calcium and calcium retention.
    • To elucidate the renal mechanisms underlying protein-induced hypercalciuria.
    • To assess the effect of combined protein and phosphorus intake variations on calcium homeostasis.

    Main Methods:

    • Controlled dietary studies in young adults.
    • Measurement of urinary calcium, phosphorus, and assessment of calcium retention.
    • Analysis of fractional renal tubular reabsorption of calcium and glomerular filtration rate.

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    Main Results:

    • Increased protein intake (50g to ~150g) significantly elevated urinary calcium and reduced calcium retention, despite constant calcium/phosphorus intake.
    • Protein-induced hypercalciuria is primarily mediated by decreased fractional renal tubular calcium reabsorption and secondarily by increased glomerular filtration rate.
    • Elevated dietary phosphorus intake counteracted the hypercalciuric effect of high protein by enhancing renal tubular calcium reabsorption.

    Conclusions:

    • High dietary protein intake, particularly from sulfur amino acids, can lead to substantial calcium losses via the kidneys.
    • Increased dietary phosphorus intake can mitigate high protein-induced calciuria.
    • Elevated protein consumption may necessitate increased dietary calcium and phosphorus intake to maintain mineral balance.