You're the one who invented a definition of "theft" that for reasons beyond my understanding consider the consuming organisms specific mechanism of utilization that also specifically considers if the organism has the ability to synthesize the structures independent of consumption and now also demands that the process be sustainable for an arbitrary (but not indefinite) amount of time AND the structures must meet an arbitrary bar of complexity (which you've proclaimed unilaterally is greater than fat) etc etc etc

I'm going to drive directly to my point now that hopefully you can see how your ever-expanding definition of "stealing" (which I promise you, I'm not even getting STARTED on pushing issues that would force you to continually expand) is just bad.

Counter Definition: Eating isn't theft. The degree to which ingested materials must be broken down to be useful is interesting, but none of it is stealing. The article used a word that while amusing to read isn't technically accurate.