Plus of course, irrespective of the provenance of particular ingredients, anything you eat on a plane will have been cooked hours before departure, let alone serving, and then chilled or frozen again. Expecting "restaurant fresh" is denying the location and logistics.

With regard to the OP, I hope they are feeling better. Severe food poisoning symptoms from a meal on the first sector would likely have come on during the connecting flight. Hopefully that wasn't the case but as others have said, unless there have been multiple reports of illness it may be related to something else (there is a lot of norovirus reported as going around Asia at the moment, for example).