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Producing heat isn’t where the mass goes though - mass is conserved. You only lose mass to energy in a nuclear reaction.
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Something has to go in there, if not losing energy to radiant heat transfer, then how e=m(c^2)?
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I’m not sure what you mean by in there but yes, the heat would be transferred to the environment.
E=m(c^2) describes how much energy is contained in matter. It’s useful for nuclear reactions, but your body isn’t a nuclear reactor and you aren’t consuming substantial quantities of radioactive isotopes, like uranium ore, that will decay on their own so it isn’t relevant here.
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