That&#x27;s the problem with the so-called &quot;calories in&#x2F;calories out&quot; crowd: they think all food has a specific energy value that varies by statistically-insignificant amounts from person to person.<p>That people lose weight when they eat an energy deficiency and gain it when they eat an energy surplus is not in doubt.  What some people refuse to do is evaluate whether the same foods have different energy values for different people, rather than one global value.  I&#x27;m not saying they do, but the most ardent &quot;calories in&#x2F;calories out&quot; fanatics refuse to even acknowledge the question.