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Fig. 5. Convergence of the linear regressions describing the relationships between fecal and urinary potassium excretions in phases 1 and 2 to a similar threshold of urinary potassium excretion (56.5–62.6 mmol/day). Dashed lines are extrapolations beyond the lowest data point for fecal and urinary potassium excretions. The threshold is a mean value reflecting inter-individual variation in the relationship between fecal and urinary potassium excretion. Above the threshold, a positive relation exists between fecal and urinary potassium excretions. Below the threshold, there is a robust negative correlation between fecal and urinary potassium excretions when subjects are maintained on a fixed potassium intake.
