People with levels above 142 milli equivalents had a 10 to 15 percent higher chance of being biologically older than their chronological age. The participants with faster aging risk also really importantly had a 64% higher risk for developing chronic disease such as heart failure, stroke, atrial fibrillation, and peripheral artery disease. These people had worse health outcomes than people who were at the lower end of the range. But decreased body water content is the most common factor that increases serum sodium, according to the authors.