Salt intake, plasma sodium, and worldwide salt reduction

Area of Science:

• Cardiovascular Health
• Public Health Nutrition
• Hypertension Management

Background:

• High salt intake (9-12 g/d) is prevalent globally.
• Current intake levels are linked to elevated blood pressure (BP) and cardiovascular disease (CVD) risk.
• Mechanisms linking salt to BP and CVD are not fully elucidated, with theories involving extracellular fluid volume and direct sodium effects.

Purpose of the Study:

• To summarize evidence on the impact of salt reduction on blood pressure and cardiovascular risk.
• To evaluate the cost-effectiveness of salt reduction strategies.
• To advocate for global population-wide salt reduction initiatives.

Main Methods:

• Review of prospective studies and outcome trials on salt intake and cardiovascular events.
• Analysis of cost-effectiveness data comparing salt reduction to other public health interventions.
• Synthesis of current understanding of salt's physiological effects on BP and the cardiovascular system.

Main Results:

• Salt intake reduction to 5-6 g/d lowers BP in hypertensive and normotensive individuals; further reduction to 3-4 g/d yields greater effects.
• Lower salt intake is associated with reduced CVD risk.
• Salt reduction is a highly cost-effective strategy for CVD prevention, on par with tobacco control.

Conclusions:

• Population-wide salt reduction is a critical public health strategy with substantial health benefits and cost savings.
• Implementing coherent strategies to reduce salt intake is recommended for all countries.
• Even modest reductions in population salt consumption can lead to significant improvements in cardiovascular health.