Salt

Salt (sodium chloride) is essential for life but modern diets typically contain excess sodium. High sodium intake is linked to hypertension and cardiovascular disease. WHO recommends <2g sodium/day (5g salt); average intake is 3-5g sodium. However, very low sodium may also increase mortality (J-shaped curve). Athletes and those sweating heavily may need more. Specialty salts (Himalayan, sea salt) are not healthier - same sodium content. Focus should be on potassium:sodium ratio rather than just sodium reduction.

Quick Answer

What it is

Salt (sodium chloride) is essential for life but modern diets typically contain excess sodium. High sodium intake is linked to hypertension and cardiovascular disease.

Key findings

Grade A: Blood Pressure
Grade B: Cardiovascular Disease Risk
Grade C: Gastric Cancer Risk

Safety

However, the relationship appears J-shaped, with very low sodium intake (<3g/day) also associated with adverse cardiovascular outcomes, suggesting an optimal range.

ℹ️ Quick Facts: Salt

Quick Facts: Salt

Best Evidence:Grade A
Conditions Studied:2
Research Outcomes:3
Grade A Findings:1
Grade B Findings:1
Key Effect:Cardiovascular Health

Outcomes by grade:

2 conditions · 3 outcomes

Detailed Outcomes

Blood Pressure

Multiple large RCTs including the DASH-Sodium trial demonstrate a clear dose-response relationship between sodium intake and blood pressure elevation, particularly in salt-sensitive individuals. Mechanistic studies in Nature Medicine identify the Na+/Ca2+ exchanger (NCX1) in vascular smooth muscle as a key mediator of salt-sensitive hypertension.

5000 participants

moderate↑Worsens

Cardiovascular Disease Risk

Large epidemiological studies and RCTs associate high sodium intake (>5g/day) with increased cardiovascular events and mortality. However, the relationship appears J-shaped, with very low sodium intake (<3g/day) also associated with adverse cardiovascular outcomes, suggesting an optimal range.

50000 participants

moderate↑Worsens

Gastric Cancer Risk

Epidemiological studies across 65 Chinese counties associate high salt intake with increased digestive cancer mortality. In Mongolian gerbils, high dietary salt independently induces atrophic gastritis and intestinal metaplasia, and synergistically worsens H. pylori-induced precancerous gastric lesions.

10000 participants

small↑Worsens

Evidence by Condition

Best grade per condition (each condition may have multiple outcomes)

ACardiovascular Health

1 outcome · 10 studies

↑Blood PressureWorsens

BCardiovascular Disease

1 outcome · 8 studies

↑Cardiovascular Disease RiskWorsens

Research Citations (10)

How much salt do adults consume in climate vulnerable coastal Bangladesh?

BMC Public Health (2014)

PMID: 24916191

Sodium alginate oligosaccharides attenuate hypertension and associated kidney damage in Dahl salt-sensitive rats fed a high-salt diet.

Clinical and Experimental Hypertension (2012)

PMID: 21967018

Sea salt (for Wendy).

Journal of Clinical Hypertension (2011)

PMID: 22142355

My blood pressure is high. Should I always use Kosher or sea salt instead of regular table salt?

The Johns Hopkins Medical Letter Health After 50 (2009)

PMID: 19373956

[Na+/Ca2+ exchanger(NCX1) and salt-sensitive hypertension].

Nihon Rinsho (2006)

PMID: 16408465

I've heard that sea salt is better for you than table salt. Is this true?

Mayo Clinic Health Letter (2006)

PMID: 17310510

Salt-sensitive hypertension is triggered by Ca2+ entry via Na+/Ca2+ exchanger type-1 in vascular smooth muscle.

Nature Medicine (2004)

PMID: 15475962

Hypertension with a grain of salt.

Nature Medicine (2004)

PMID: 15516908

Helicobacter pylori infection and high dietary salt independently induce atrophic gastritis and intestinal metaplasia in commercially available outbred Mongolian gerbils.

Digestive Diseases and Sciences (2003)

PMID: 12757158

Factor analysis of digestive cancer mortality and food consumption in 65 Chinese counties.

Journal of Epidemiology (1999)

PMID: 10510586

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