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Intracellular electrolytes and hormonal parameters during weight reduction.

W Zidek, C Karoff, H Losse

    Annals of Nutrition & Metabolism
    |January 1, 1984
    PubMed
    Summary

    Weight reduction lowers blood pressure by decreasing intracellular sodium and increasing plasma PGI2. This study monitored electrolyte and hormone changes in obese individuals during a calorie-restricted diet.

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    Area of Science:

    • Endocrinology
    • Cardiovascular Physiology
    • Nutritional Science

    Background:

    • The blood pressure-lowering effects of weight reduction are not fully understood.
    • Obesity is a significant risk factor for hypertension.
    • Understanding the underlying mechanisms is crucial for effective management.

    Purpose of the Study:

    • To investigate the changes in intracellular electrolyte composition and hormonal parameters during a short-term, calorie-restricted diet in obese individuals.
    • To elucidate the mechanisms contributing to the blood pressure-lowering effect of weight reduction.

    Main Methods:

    • 12 obese subjects participated in a 10-day diet of 800 kcal/day.
    • Intracellular electrolyte concentrations (Na+, K+, Mg2+) and plasma hormonal levels (aldosterone, renin, PGI2) were monitored.

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  • Statistical analysis was performed to determine significance (p < 0.05).

    • Main Results:

    • A significant decrease in intracellular free Na+ (p < 0.05) and Mg2+ (p < 0.01) was observed.
    • Total intracellular K+ also decreased significantly (p < 0.05).
    • Plasma aldosterone and renin activity increased (p < 0.05), likely due to salt restriction.
    • Plasma PGI2 concentration significantly increased (p < 0.05).

    Conclusions:

    • Decreased intracellular Na+ may result from salt restriction during dieting.
    • Reduced intracellular K+ and Mg2+ could be linked to hormonal changes, possibly altered insulin secretion.
    • The reduction in intracellular Na+ and increase in plasma PGI2 are potential contributors to the hemodynamic effects of weight reduction.