- The study analyzed sodium excretion levels in 4,931 young healthy Japanese women over a 20-year period (1995-2015) using spot urine samples collected at Nakamura Gakuen University.
- There were three time periods analyzed: 1995-2001, 2002-2007, and 2008-2015, with results showing significant decreases in sodium and potassium excretion levels as well as the sodium-to-potassium ratio in the later periods.
- Both sodium and potassium excretion levels, adjusted for body weight, and systolic blood pressure declined significantly over the years, indicating a shift in dietary intake or health practices in this demographic.