The food in our company canteen hurts my stomach. I wonder if there is anything unclean.

Is everyone in your company like this? Or are you the only one who has this situation? If it happens to everyone, I suggest you communicate with the management of the canteen first, and then report to your leader, so that the leaders of both sides can come forward to solve it. I think things can be handled properly. If this happens to you personally, then you have to increase your own system, because your immunity is a little too low.