Ran the calculations some time ago, and donating a half liter of blood gets rid of about 500kcal, which I can easily manage to do in under half hour not counting the paperwork. I think the only more calorie-consuming activity I can think of is liposuction or mutilation of body parts. Not that I recommend either, just a random thought.

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[–] PolarKraken@lemmy.dbzer0.com 1 points 4 days ago

Yeah, tbh I didn't bother looking at what would/could be truly burned at rest, that was lazy of me. Just wanted to indicate how far off "burning" 400 in that way was.