A research team from Vanderbilt University has found that excessive dietary sodium intake can independently increase the risk of heart failure, particularly among individuals already vulnerable to cardiovascular disease.
The study, published in Journal of the American College of Cardiology: Advances, examined health and dietary data from more than 25,300 adults across the southeastern United States.
Researchers noted that the study population largely comprised Black and low-income participants, groups that historically face a higher burden of heart disease. The findings highlight the role of dietary factors in exacerbating existing health inequities.
According to the analysis, participants consumed an average of 4,269 milligrams of sodium per day, nearly twice the maximum recommended intake. This level of consumption was associated with a 15% higher risk of developing new-onset heart disease.
The study further found that nearly 80% of participants exceeded recommended sodium limits, while each additional 1,000 milligrams of daily sodium intake increased the risk of first-time heart failure by 8%, demonstrating a clear and measurable dose-response relationship.
Health guidelines issued by the American Heart Association and U.S. federal agencies recommend limiting sodium intake to no more than 2,300 milligrams per day.
Researchers emphasized that even modest reductions in salt consumption could lead to meaningful improvements in cardiovascular outcomes, particularly in high-risk populations where the prevalence of heart disease remains disproportionately high.
The findings provide strong evidence that sodium reduction should remain a central focus of public health strategies aimed at preventing heart failure and reducing long-term cardiovascular risk.
