That's a fun point, I wonder if we'll end up renting food and if we don't pay back then the latent toxins within it could be activated remotely...

Isn't there an aside in The Hitch Hiker's Guide To The Galaxy where if you don't get a receipt when you go to the toilet on a specific planet (that has severe issues due to over-tourism) such that any weight imbalance is surgically removed when you leave?

Maybe we'll have to return the raw materials, less an "energy percentage" that keeps us alive, a bit like returning glass bottled for the deposit in the old times!