Digestion is independent of physical activity

The author wished to put a certain equation to the test.  It is Co = RMR x FA.  Co = calories necessary to maintain human body weight, RMR = resting metabolic rate and FA= activity factor where 1.3<FA<1.9.  Co was substituted into another equation, Dk (dW/dt)o = - (Co – Ce), where Dk = conversion factor, (dW/dt)o = weight change rate and Ce = calories eaten per day.  Co is eliminated between the two equations and data is used from the author’s 2012 paper to test this.  Average values are obtained and plugged in.  The left-hand side agrees with the right-hand side to a little over 7%, fairly good agreement.  Now, it is well known that the digestive tract answers to the medulla oblongata in the bottom of the brain and the muscles answer to the cerebellum in the hind brain.  Since these are separate, it is argued that RMR and FA are independent variables, meaning that digestion is independent of physical activity.