Don’t recall having this discussion, but it’s possible I think the topic is fascinating for sure.
As to that experiment, the big variable is metabolism, right? I mean - when you metabolize food into whatever your body wants to do with it, I would assume a part of that food would be used to synthesize whatever it required for its own purposes, some of it would go to waste, a certain level of fat might be burned off and breathed out, etc. So I have to assume that the weight of the human could be widely variable - at least that’s my knee-jerk answer.