Look, you don't have food poisoning. What you have, if you MUST tell me about it, is THE FOOD FLU.
I get it. You are uncomfortable, you feel like crap and you don't have control of bodily functions. I've been there too. BUT, if you aren't at work for only one day because of this - or you are feeling somehow obligated to give an excuse - don't use the word poisoning.
Poisoning, to me, implies someone purposely tried to get you. Intentionally and with clever planning. Not the kind of discomfort you got when YOU chose to eat food from some hinky place that serves a combo plate of tummy rumbler and clown agitator. This meal which you adore because sometimes, piss poor quality food just tastes good.
Just like rain is not a storm. Don't be the evening news. Don't go on storm watch just because someone here in California was reported to have used their windshield wipers. For a full sweep and a half.
Granted, you might not always knowingly eat dodgy entrees, but unless you are now in communication with the CDC, realize you are the victim of the FOOD FLU.