"for" or "of"

[Dave Hause]

And why are they roughly equal in the medical community?  Having thought
myself reasonably literate as physicians go and after subscribing to this
list for almost 2 years, I'm not sure I understand your reason and I'd bet
less than 2% of my physician colleagues would.
Dave Hause, dwhause at jobe.net
Ft. Leonard Wood, MO
----- Original Message -----
From: "Mark A. Mandel" <mamandel at LDC.UPENN.EDU>
>³...reduce your risk for a heart attack or stroke.²
>
>³...reduce your risk of a heart attack or stroke.²

I'll give you a reason: "of" is the default preposition to mark the object
of a nominalized verb.