To paraphrase Mandelbrot ( aka Slartibartfast) ;

Simple thermodynamics does not predict results in complex chaotic systems.  In 
such systems, the only way you can keep results in the normal, optimum, range is 
to keep the variables ( although not their chaotically variable amounts) 
constant.  

By keeping the input ( food ) variables to those edible to Primates in Nature, 
we assure that the optimal results will be obtained in the most efficient 
fashion. 


Or we could just apply Occam's Razor........

Ray Audette 
[Gray-Hawk's off studying Fractal Geometry at Duke University this week in 
Durham NC]