Originally Posted by
tadawdy
Did people evolve to perform very long bouts of intense aerobic effort? Probably not.
Actually, we did.
http://www.nytimes.com/2009/10/27/health/27well.html
I like some carbs and a bit of protein post-ride. More if the ride was long and I am hungry. I don't think that it makes much difference what the exact ratio is, and the only advantage that mixes have over real food is convenience.