Buen provecho! Bon Appetite! Today, was a nice day to spend some time at the park, the waether was great not too hot, so I went at the park and there was a Canadien girl eating luch, she is a really nice girl and easy to talk with. As a Mexican I have the habit, when I see somebody eating, to say "buen provecho", I think for us it is normal, is a way to be polite when we see sombody eating, I wanted to be polite with her, but then I was wondering: How can I say "buen provecho" in English?, I don´t know! So I asked her, she told me in English there is not a way to say that, Canadien people don´t use to say anything when they see somebody eating and they are not impolite, is just that they don´t have the habit or they use the French expression: Bon appetite!. So, that´s something I learn today about other cultures and the concept to be polite or impolite. Thank you very much for your corrections.