this post was submitted on 08 Aug 2023
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So I just went and donated blood again and durring the recovery period it occured to me that it takes quite a bit of work for your body to regenerate that lost blood volume and the actual blood cells. Regrowing that many cells seems like it would be fairly energetically intensive. So how many calories does producing all those new blood cells actually consume? Is there even a way to know that?

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[–] fubo@lemmy.world 60 points 1 year ago* (last edited 1 year ago) (2 children)

The number floating around the web is 650 calories but I haven't been able to track down the actual source.

(Google Scholar is no help at all. Whoever these UCSD researchers are, I have no bloody clue.)

[–] Overzeetop@kbin.social 21 points 1 year ago (2 children)

So I can shotgun two pints of beer after a donation (gotta rehydrate!) and still be a couple hundred calories ahead? Win-win!

[–] jscummy@sh.itjust.works 22 points 1 year ago (1 children)

And you'll get drunker due to the blood loss!

[–] FartsWithAnAccent@lemmy.world 11 points 1 year ago

brb, donating blood

[–] Scrollone@feddit.it 3 points 1 year ago

Jokes aside, you shouldn't drink alcohol the day before and after your donation

[–] Fosheze@lemmy.world 5 points 1 year ago (2 children)

Hmm. Not as much as I hoped. You could probably eat that many calories in the free snacks they have afterwords without anyone even looking at you funny.

[–] DrMango@lemmy.world 8 points 1 year ago

There is no good way to outpace calorie consumption with activity. It is far far easier for humans to consume usable calories than it is for us to spend them.

In our ancestors this meant that we were able to go a long time between good meals during times of scarcity and still survive, but today it just means that if you're worried about calories you should start in the kitchen, not the gym

[–] key@lemmy.keychat.org 4 points 1 year ago (1 children)

Eat the snacks before donating. That way your blood glucose spikes and you 'burn' maximum calories.

Grow a wizard beard. That way you have crumbs and can eat while donating too.