I see that really there is no final analysis with regards to moving beyond food. The intellect won't get it. There are deeper and greater impulses that govern the process. So much talk of a technical nature, of energy this or that, while perhaps keeping the mind focused, doesn't really lead to breatharianism. It's a way of entertaining the mind, in the right direction, nothing more.
What actually happens, is so subtle that the intellect is helpless. Only experiential feeling matters.