I think it definitely does exist but unfortunately due to genetics, environment/complexities and humans limited intellect no one will ever be able to follow the closest thing possible to their specific perfect diet. That doesn't mean we can't get fairly close though by seeing what we should be adapted to and applying the ever expanding science to it.
Here is the real kicker though. If you are eating the closest thing to a perfect diet then you might do better in the short term but what about the removal of the selection pressure? Does that mean future generations will be weaker than they could have been if you made them eat a little dirt with their lunch?