I love coffee - but I've been having decaf for the last 6 months or so. Some part of me still feels guilty for even having that!!

I have a food question too. I often make up stirfrys and eat the leftovers for lunch the next day - is there any thread of listeria breeding in this the way there is in a preprepared salad?? I normally just eat it cold, but would it kill any bugs if I nuked it?