Fig. 1. Inter and intra-individual variability in fecal/urinary potassium and fecal otal (urinary + fecal) potassium excretion ratios for the 10 subjects of Phase 1 (fixed potassium intake) of the study. Subjects were stratified in descending order by the mean (horizontal lines) of the fecal/urinary potassium excretion ratio expressed as a percentage.