jwcalla do you have any specific reasons for that?
I guess it's important to delineate what, in my mind, I consider a post-workout "drink" and a post-workout "meal". I think of the drink as the thing you take immediately after you finish your workout. The meal I consider to be the first meal after your workout. So for example, I workout in late afternoons and my post-workout "meal" is actually dinner. Here I eat anything and everything healthy that I can -- P/C/F, all of it.
But my understanding is that the point of the post-workout drink is to get an immediate insulin spike, halt catabolism, and restore glycogen and nutrients to the muscles. Therefore, one would want a fast-digesting drink. And, generally speaking, fats slow down digestion and absorption.
How much does it all really matter? I dunno. How much could it really affect your gains? Dunno that either. Chances are there are many other important things that take a priority over this.
For more info., read through this thread: