Well but then diagnosing this equals to making our own nature wrong(or sick) by definition and then it's a paradox... if we need to start synthetically molding our body and cognitive functions that are healthy for the animal we are because it doesn't fit the society we designed and built for us ourselves to live comfortably... well, then something's wrong.
As a species, those of us in the developed world stopped evolving in many ways since the industrial revolution. Traits that increased the probability of reproduction hundreds, thousands, or millions of years ago stopped becoming a competitive advantage.
What you describe is not a paradox. The brain can self-diagnose and regulate the individual. Sometimes it's the introduction of foreign chemicals into the system (food, medication, whatever) and sometimes it is internal restructuring (learning).
