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Updated: Jun 10, 2025

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Dietary salt, vascular dysfunction, and cognitive impairment.

Giuseppe Faraco1

  • 1Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, 407 East 61st Street, New York, NY 10065, USA.

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Summary

Excessive salt intake harms brain blood vessels and cognitive function, independent of blood pressure effects. High salt also disrupts gut immunity, particularly T helper 17 cell balance, potentially worsening brain issues.

Keywords:
Cognitive impairmentEndothelial dysfunctionSodium chlorideTh17 cells

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Area of Science:

  • Neuroscience
  • Immunology
  • Cardiovascular Science

Background:

  • Excessive salt consumption is a global health issue linked to cardiovascular diseases like hypertension and stroke.
  • High salt intake is increasingly associated with cognitive impairment, dementia, and Alzheimer's disease pathology.
  • Salt's detrimental effects on the brain's vasculature and blood supply are recognized, but mechanisms require further study.

Purpose of the Study:

  • To review evidence on salt's impact on vascular and cognitive function, independent of blood pressure changes.
  • To explore the link between high salt intake, gut immunity dysregulation, and T helper 17 (Th17) cell homeostasis.
  • To discuss the role of IL-17A in salt-induced vascular and cognitive impairments.

Main Methods:

  • Review of experimental models and human studies examining salt's effects on brain vasculature and cognition.
  • Analysis of research on salt's influence on immune cell function, specifically Th17 cells.
  • Examination of data linking IL-17A to vascular dysfunction and cognitive decline.

Main Results:

  • High salt intake negatively affects cerebral vasculature and cognitive function, even without altering blood pressure.
  • Salt consumption disrupts gut immunity, leading to Th17 cell imbalance.
  • Evidence suggests IL-17A, a Th17 cytokine, contributes to salt-induced vascular and cognitive problems.

Conclusions:

  • Excessive salt intake poses risks to brain health through vascular and immune pathways, independent of hypertension.
  • Maintaining a balanced immune system, particularly Th17 cell homeostasis, is crucial for mitigating salt's adverse effects on the brain.
  • Further research is needed to fully understand and address the complex relationship between salt, immunity, and cognitive function.