Associations between sodium, potassium, and blood pressure: results from the Hispanic Community Health Study/Study of Latinos, a prospective cohort study

Am J Clin Nutr. 2024 May;119(5):1155-1163. doi: 10.1016/j.ajcnut.2024.02.032. Epub 2024 Mar 1.

Abstract

Background: Although the subject of numerous studies, the associations between dietary sodium, potassium, and the ratio of dietary sodium to potassium with blood pressure are not clear-cut. In addition, there is a paucity of research on these relationships in prospective cohort studies with representation from diverse Hispanic/Latino adults.

Objectives: To evaluate the associations between dietary intake of sodium, potassium, and the ratio of dietary sodium to potassium and blood pressure in a diverse sample of Hispanics living in the United States.

Methods: This analysis included 11,429 Hispanic/Latino participants of the prospective cohort Hispanic Community Health Study/Study of Latinos recruited between 2008 and 2011 in visit 1 who participated in a follow-up visit in 2014-2017. Dietary sodium and potassium intakes were averaged from 2 interviewer-administered 24-h diet recalls collected at visit 1. At both visits, blood pressure was measured 3 times in a seated position and averaged. We assessed the relationship between dietary sodium, potassium, and the sodium-to-potassium ratio with changes in systolic and diastolic blood pressure using survey-weighted multivariable-adjusted regression models.

Results: At visit 1, the mean age was 41 y, and the mean sodium intake was 3203 mg/d. Each 500 mg/d sodium increment in intake was associated with an increase in systolic blood pressure (β: 0.35 [mmHg]; 95% confidence interval: 0.06, 0.63) and diastolic blood pressure (β: 0.45 [mmHg]; 95% confidence interval: 0.08, 0.82). Dietary potassium and the molar ratio of dietary sodium to potassium were not associated with changes in systolic or diastolic blood pressure.

Conclusions: Among a large sample of diverse United States Hispanic/Latino adults, higher sodium intake was associated with small increases in systolic blood pressure over 6 y. This research underscores the importance of dietary sodium reduction in maintaining lower blood pressure.

Keywords: healthy eating; heart health; nutrition; nutritional epidemiology; salt.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult
  • Blood Pressure*
  • Cohort Studies
  • Female
  • Hispanic or Latino*
  • Humans
  • Male
  • Middle Aged
  • Potassium / blood
  • Potassium, Dietary* / administration & dosage
  • Prospective Studies
  • Sodium, Dietary* / administration & dosage
  • United States

Substances

  • Sodium, Dietary
  • Potassium, Dietary
  • Potassium