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I assume that you are remembering to include drinking water in the
"food" calculation. There are other mass exchanges as well with
sweating and respiration. We breath out a lot of water vapor (its been
-30 here in Winnipeg this week, I've seen that one a lot) plus exchange
O2 for CO2. Hence there is a net loss of weight from breathing. This
might be an interesting back of the envelope calculation.