Anonymous wrote:I don't even refrigerate mine and have never gotten sick. It no different than canning.
I disagree with this. If the grapefruit had been "canned" like the fruit cups that are shelf stable, then the fruit has been heated in the package to kill pathogens. If the fruit was not heated in the package, then it needs to be refrigerated because it is not sterile inside the package. I am guessing that you think the OP is talking about generic fruit cups off the shelf and not ones that came from the refrigerated case at the store.