All illnesses are, by definition, bad. That is what makes them &quot;illnesses&quot; and not &quot;wellnesses&quot;. You can argue about whether a particular differentiated state is an &quot;illness&quot; or not, but that is just the same as arguing whether or not it is &quot;bad&quot;.<p>As for your point... I fail to see the connection. It seems to me that treading carefully when equating &quot;brain health&quot; with &quot;intelligence&quot; is entirely the correct approach, regardless of one&#x27;s opinion on which specific things count as &quot;illness&quot;. Are you saying that there isn&#x27;t a <i>single</i> mental disorder correlated with intelligence?