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Message: <blockquote data-quote="andrewk" data-source="post: 313851" data-attributes="member: 37453">That is just school-boy maths - and should perhaps be prefaced by "all other things being equal".   Can you cite any real published studies that substantiate that human bodies actually behave in such an idealistic fashion?   There are references in the Gary Taubes book to several studies that give inconsistent results, such as folk gaining weight when eating less and the converse.  Unless you can explain the reason for such inconsistent results then you are simply kite flying.I don't see that the Second Law of Thermodynamics has any relevance to "system losses", whatever you mean by that.  For those who don't know, the Second Law states - "The entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium"As you correctly say, "obviously you have to account for waste matter".   I have yet to see any serious study that has measured changes in metabolic rate and also the energy in urine, faeces, perspiration,  breathing and so on whilst trialing changes in diet composition and calory content.  Isn't it true that the lack of such solid science is precisely the reason why there is still disagreement about the effectiveness or otherwise of different diets??</blockquote>

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