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Errors in potassium balance.

G B Forbes, R Lantigua, J M Amatruda

    The American Journal of Clinical Nutrition
    |January 1, 1981
    PubMed
    Summary
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    Potassium balance studies in overweight adults on low-calorie diets showed significant underestimation of body potassium loss. Unmeasured losses varied greatly, preventing a single correction factor for accurate metabolic balance assessments.

    Area of Science:

    • Human Physiology
    • Nutritional Science
    • Metabolic Studies

    Background:

    • Accurate assessment of potassium (K) balance is crucial for understanding nutritional status.
    • Low-calorie diets can impact electrolyte homeostasis.
    • Total body potassium measurement provides a direct assessment of body K stores.

    Purpose of the Study:

    • To compare metabolic potassium balance with direct total body potassium measurements.
    • To evaluate the accuracy of potassium balance studies in overweight adults on a low-calorie diet.
    • To determine the extent of unmeasured potassium losses.

    Main Methods:

    • Six overweight adult subjects were placed on a low-calorie diet for 29-40 days.
    • Metabolic balance of potassium was calculated.

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  • Total body potassium was frequently measured using 40K whole-body counting.

    • Main Results:

    • Metabolic potassium balance underestimated actual body potassium losses by 11% to 87% (average 43%).
    • Significant intersubject variability in unmeasured potassium losses was observed.
    • A single correction factor for unmeasured losses is not reliable.

    Conclusions:

    • Metabolic balance studies significantly underestimate potassium loss in overweight adults on low-calorie diets.
    • Unmeasured potassium losses are highly variable between individuals.
    • Current methods for potassium balance assessment require refinement for clinical use.