Well, that's actually theoretically possible, although it would not be a prefered method.
If you can, at a fundamental level, explain all possible interactions between matter, energy, space-time and forces, you can model the internal relationship of atoms, then use this to model molecules, then chemical processes, then biological processes, and such.
The problem is that you would need to include such an enormous amount of complexity if you want to make a model that takes into account every single particle in your body, all forces acting on it, and all the relationships between exactly everything going on.
It IS possible to do this, in the same way it's possible to model a forum post as the result of a specific set of electrical signals in the elements that makes up a computer, but it is neither easy nor required to do so. It is much easier to model it as words.