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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[–] infuziSporg@hexbear.net 2 points 2 days ago* (last edited 2 days ago)

My experience was the opposite: $200 for the first 3 donations, and then like $30-40 for each one after that, over a six-month span.

I ended up only doing it twice, and getting a part-time job while buying rice and dry beans instead.