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@freemo
[You may know all this better than I do. I'm not trying to mansplain it to you, but explaining for the benefit of other readers.]
Did you urinate more than usual? If it's not water loss from sweating, the main way you lose body weight is by fat broken down into ketones (lipolysis, ketosis), excreted by urination.
The other alternative is muscle tissue being broken down (ketoacidosis), which is very bad, but shouldn't notmally happen.