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Ingested food is broken down into the macronutrient components and then absorbed into the body. They are then used immediately or stored for future use. However, our energy efficiency is very low. So, is most of the energy in food lost to feces or in the process of expending the absorbed food?

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  • $\begingroup$ How about 'in the process of storing it in usable forms (like ATP)'? $\endgroup$ – another 'Homo sapien' Jul 16 '18 at 13:39
  • $\begingroup$ Our energy efficiency is very high, higher than the vast majority of engines. so what are you asking? $\endgroup$ – John Jul 16 '18 at 16:09
  • $\begingroup$ Possible duplicate of biology.stackexchange.com/questions/21107/… $\endgroup$ – John Jul 16 '18 at 16:09
  • $\begingroup$ Please summarize the content of evidence you cite to support statements in questions. Expecting users to read long articles on other sites (sites which have expired certificates) is not on. The basic problem with your question is that you do not specify clearly what you mean by energy efficiency. Your talk about feces suggests you are thinking about the percent of nutrients that are digested from a meal, which has nothing to do with energy efficiency. And what do you mean by "expending the absorbed food"? Clarify what you mean or your question will be regarded as unclear. $\endgroup$ – David Jul 16 '18 at 21:30

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