This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
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I don't know about varying the amount of water. But if you want to eat fewer calories of rice, there was an article that came out recently saying that the method you use to prepare it could affect the amount of calories your body actually absorbed from it.