So, you've made - repeatedly - the completely obvious point that, if you can account for every term in the equation, calories in - calories out = change in weight.

Thank you for that. Now if you'd like to adopt the assumption that your audience isn't brainless, let's talk about the interesting point that everyone wants to be talking about: that the 'calories out' number varies for the same 'calories in' number across people, diets, and behaviors.