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Actual weight loss during a fast?

Hello! I am 36 hour in 72 hour fast. I had my last meal on Thursday at midnight, and weighed 85.9 kg on Friday morning. I somehow weighed 84.2 kg this morning, which seems a steep jump. I know most of this would be water weight, but how do I figure out how much actual weight I lost during the fast? Any suggestions would be helpful 😊. Thanks

Answer

RMR / 7,700 = kg per day

edit, obviously if you track your exercise you can count those calories too, but over short durations, an extra few hundred calories have a pretty meaningless effect. I’d only concern myself with tracking exercise if I was doing a very long fast where the exercise could eventually count for at least calories in 1 preferred unit weight, in this case, 7,700… which is a lot lol