I'd guess cases of cannibalism start turning up during the winter of 97-98 after the nukes fly and tractor trailer loads of food stop turning up to replenish the local grocery store.
Probably more commonly its an issue of poorly armed, poorly equipped (both in terms of hardware as well as know how) civilians preying on other civilians in the Twilight game universe, where food is not wildly scarce and the population isn't falling down to the 90%+ death toll. People in military units, and even larger marauder bands, would be able to shake down somebody else for enough food to not have to resort to cannibalism.
Of course, there'd always be room for cannibal cult/armies like in Pournelle/Niven's Lucifer's Hammer as a possibly extra ugly opponent for PCs. Might not work that well in Poland/Germany, where surviving troop densities would make pretty short work of a big pack of ghouls, but back CONUS, or the uncontrolled parts of the UK, etc., they'd work.
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