&gt; Because there is little to no evidence for that, and I&#x27;m talking about metabolic ward quality evidence.<p>Do you happen to know (I don&#x27;t) if &quot;caloric uptake&quot; specifically has been studied closely?  Specifically:<p>* When you consume &lt;x&gt; calories, how many are extracted by the body and how many are excreted?  
* Can this vary by food type?  
* Can this vary across persons, and across time for the same person?<p>From personal experience I have witnessed what seems to be impossible, and my diet was so simplistic (sausage, bacon, spinach, multi-vitamins) that I couldn&#x27;t have been making a mistake, yet I hit a plateau.  The only logical explanation I can think of is a massive short term change in caloric extraction.