Too Much Love Can Kill You

So says Meatloaf.  On what evidence does he base this claim?  I have read many medical and psychological text books, none of which make the love=death link.  There appears no factual basis for this claim, no evidence, no randomised controlled trials exposing subjects to two conditions:

 

Condtion A-not enough love

Condition B- too much love

Where is it established that the independant variable (IV=love) is manipulated to see if it has an effect on the Dependant variable (DV=life/death status)?  I’d like to read that research, Mealoaf.  Which peer reviewed journal does it appear in?  The international journal of spurious bollocks?  The Australian journal of shit?  Lies!  The Magazine?

I can only conclude that this supposition is INCORRECT.