Health effects of dietary salt
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Cardiovascular Health Effects of Dietary Salt
High dietary salt intake is strongly linked to increased blood pressure, which is a major risk factor for cardiovascular diseases such as heart attacks and strokes 1356+3 MORE. Reducing salt intake has been shown to lower blood pressure and decrease the risk of cardiovascular events, with benefits observed across all population groups, including greater benefits for certain subgroups like older adults, women, and Black individuals 3610. Excess salt also increases the mass of the left ventricle, thickens arteries, and raises the risk of stroke and heart failure, even beyond its effects on blood pressure 149.
Kidney Disease and Renal Health
Excessive salt consumption is associated with the progression of chronic kidney disease (CKD) and a higher risk of end-stage renal disease 1358. High salt intake can worsen proteinuria (protein in urine) and accelerate the decline in kidney function, especially in people with hypertension or pre-existing kidney conditions 38. Salt-induced kidney damage can occur through mechanisms such as glomerular hyperfiltration and increased arterial stiffness 39.
Metabolic and Energy Balance Effects
Emerging evidence suggests that high salt intake may contribute to metabolic disorders, including insulin resistance and altered hormonal regulation, which can impact energy balance and potentially promote obesity . Salt may also induce thermogenesis and increase energy expenditure, but these effects do not outweigh the negative consequences of chronic high salt intake on cardiovascular and metabolic health .
Blood Pressure-Independent Effects
Salt can harm the body even in people who do not develop high blood pressure. It can impair endothelial function, increase arterial stiffness, and promote inflammation and oxidative stress, all of which contribute to long-term organ damage and disease risk 149. These effects are seen in the heart, blood vessels, kidneys, skin, brain, and bones 14.
Other Health Impacts
High dietary salt intake is linked to reduced bone density, especially in post-menopausal women, and may influence the risk of stomach cancer and the severity of asthma in some individuals . Salt sensitivity, where blood pressure responds strongly to salt intake, is an important risk factor for cardiovascular events and mortality, even in people who are initially normotensive .
Public Health and Policy Implications
Population-level salt reduction strategies, such as reformulating processed foods and public education, are effective in lowering blood pressure and reducing the burden of cardiovascular and kidney diseases 356. Even modest reductions in salt intake can save thousands of lives and billions in healthcare costs annually . The most successful interventions involve coordinated efforts among governments, the food industry, and public health organizations 35.
Conclusion
Excessive dietary salt intake is a major contributor to high blood pressure, cardiovascular disease, kidney disease, and other health problems. Reducing salt intake benefits all population groups and is a cost-effective public health strategy. The harmful effects of salt extend beyond blood pressure, affecting multiple organs and metabolic processes. Comprehensive efforts to reduce salt consumption are essential for improving global health outcomes.
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