As a person on dialysis (my kidneys don’t work so I hardly pee at all) it is normal to gain 2 to 3 kg between treatments ( dialysis Mon Wed Fri). Liquids are heavy. We loose liquids thru respiration, perspiration and peeing. Day to day weight variations are normal and also strongly influenced but sodium intake. I recall one weight loss program citing “a pound a pickle” due to the high sodium content of a pickle. I find your unscientific observation fascinating. Our bodies are amazing machines.

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