All it takes is the one bite that’s contaminated. Be careful watch your BG’s and test for ketones. If you get worried call 111. If you took insulin and you start throwing up it can be a problem, you have to keep a close eye on yourself. If you start dropping BG levels, soda might have a chance at sipping and keeping down to bring up BG’s. Especially real ginger ale. Or sucking on a jelly .
But you have to be really careful, food poisoning can be quite dangerous. Any doubts call 111.