Why does food and water weigh more outside the body than when ingested?

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It's not E mc^2

It doesn't.

However, the perception that it does may come from an observation that, after eating a 2.0 kg meal, your body mass does not increase by 2.0 kg.  You are constantly losing body mass through normal functions like perspiration, breathing and excretion.

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What Happens to Food after It Is Ingested?  Does food weigh the same once it's metabolized?  How much of your body weight is food and water that you have ingested?