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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[–] Omegamint@hexbear.net 9 points 5 days ago (2 children)

My dad used to give blood a lot and he would talk about how great it was for his blood pressure, lmao.

[–] quarrk@hexbear.net 7 points 5 days ago* (last edited 5 days ago) (1 children)

Routine blood donation / letting supposedly reduces concentrations of lead and certain “forever chemicals” too

[–] AssortedBiscuits@hexbear.net 3 points 4 days ago

That's apparently disputed/not as much as proponents claim, but donating blood definitely works on people with too much iron in their bodies.

[–] Feed_el_Castro@hexbear.net 4 points 5 days ago

Damn, I never even considered that. Literally the same solution as for heating systems: too much pressure? Just purge the liquid!