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It's vegans who avoid all animal products, vegetarians only avoid animal flesh.

And then there are the fishitarians. Because fish have no soul.

And there are oystrovegans. Who eat vegan food and oysters. Because oysters have the mental capacities of venus flytraps. Incidentally I think this would be a good, mostly sustainable and cruelty-free diet, weren't it for the price of oysters.

I have a good moral argument that you should only eat animals and fungi, not plants:

Plants are autotrophs and don't eat other things. Animals are heterotrophs and do it other things. Applying the Golden Rule in reverse, it's fine to do to lifeforms what they do to others.

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