How does coffee become decaffeinated? Is it healthy for you, or is the coffee equivalent of diet sodas?

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How does coffee become decaffeinated? Is it healthy for you, or is the coffee equivalent of diet sodas?

In: Chemistry

The method I’m aware of is that they basically wash the beans with liquid Co2, and make “Co2 coffee” with it until they have removed at least half the caffeine. I’m sure there are other methods, but this in particular wouldn’t make it toxic or anything. Just weaker since it’s been used already.