Change in salt intake affects blood pressure of chimpanzees: Implications for human populations

Paul Elliott, Lesley L. Walker, Mark P. Little, John R. Blair-West, Robert E. Shade, D. Rick Lee, Pierre Rouquet, Eric Leroy, Xavier Jeunemaitre, Raymond Ardaillou, Francoise Paillard, Pierre Meneton, Derek A. Denton

    Research output: Contribution to journalArticlepeer-review

    80 Scopus citations

    Abstract

    BACKGROUND - Addition of up to 15.0 g/d salt to the diet of chimpanzees caused large rises in blood pressure, which reversed when the added salt was removed. Effects of more modest alterations to sodium intakes in chimpanzees, akin to current efforts to lower sodium intakes in the human population, are unknown. METHODS AND RESULTS - Sodium intakes were altered among 17 chimpanzees in Franceville, Gabon, and 110 chimpanzees in Bastrop, Tex. In Gabon, chimpanzees had a biscuit diet of constant nutrient composition except that the sodium content was changed episodically over 3 years from 75 to 35 to 120 mmol/d. In Bastrop, animals were divided into 2 groups; 1 group continued on the standard diet of 250 mmol/d sodium for 2 years, and sodium intake was halved for the other group. Lower sodium intake was associated with lower systolic, diastolic, and mean arterial blood pressures in Gabon (2-tailed P<0.001, unadjusted and adjusted for age, sex, and baseline weight) and Bastrop (P<0.01, unadjusted; P=0.08 to 0.10, adjusted), with no threshold down to 35 mmol/d sodium. For systolic pressure, estimates were -12.7 mm Hg (95% confidence interval, -16.9 to -8.5, adjusted) per 100 mmol/d lower sodium in Gabon and -10.9 mm Hg (95% confidence interval, -18.9 to -2.9, unadjusted) and -5.7 mm Hg (95% confidence interval, -12.2 to 0.7, adjusted) for sodium intake lower by 122 mmol/d in Bastrop. Baseline systolic pressures higher by 10 mm Hg were associated with larger falls in systolic pressure by 4.3/2.9 mm Hg in Gabon/Bastrop per 100 mmol/d lower sodium. CONCLUSIONS - These findings from an essentially single-variable experiment in the species closest to Homo sapiens with high intakes of calcium and potassium support intensified public health efforts to lower sodium intake in the human population.

    Original languageEnglish (US)
    Pages (from-to)1563-1568
    Number of pages6
    JournalCirculation
    Volume116
    Issue number14
    DOIs
    StatePublished - Oct 2007

    Keywords

    • Blood pressure
    • Diet
    • Hypertension
    • Sodium

    ASJC Scopus subject areas

    • Cardiology and Cardiovascular Medicine
    • Physiology (medical)

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