Simple linear regression analyses revealed significant positive associations of fecal GP2 levels with smoking (p < 0.001), BMI (p < 0.001), alcohol consumption (p = 0.001), hs-CRP (p = 0.002), and fatty liver disease (p < 0.005) whereas inverse associations were found with higher FFS values (p < 0.001), female sex (p < 0.001), fecal elastase (p < 0.001), age (p < 0.001), and chronic kidney disease (p = 0.047). Here, GP2 is linked to chronic kidney disease.