I just meant hydration. Referring to a sugary drink was confusing, sorry.
A housemate in college was doing his medical school work, mentioned a situation in a hospital when someone had a kidney removed. The doctor the next day asked how she was feeling, and she said ”Oh, much better than when I had the other one removed 10 years ago.”
Panic flipping through the medical charts, then quickly arranging for dialysis. Back in the days when all records were on paper…
It’s not quite the same thing but for wastewater analysis (of e.g. drugs or ‘rona), researchers will normalize against bio markers like creatinine or viral fecal markers to account for different dilutions.