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Just buy two groceries at once and preserve one of them.
Just stop eating, duh
Sometimes I buy groceries and just think about the fact that I’m going to poop it all out later.
Actually, the nutrients and glucose will be absorbed by your intestines. You’ll pee the nutrients out, and breathe the carbon in the glucose out.
Plant a garden
I plant vegetables. They get eaten. I plant vegetables. They get eaten.
Then add a 3rd step: Shit in your compost. And a 4th: post about it on Lemmy