Lena, You could say... Bon appetit. Good appetite. Enjoy your meal. Enjoy your dinner, breakfast, supper, etc. Have a good meal. I hope you will find everything to your taste. Savor your meal. Regale your tastebuds. If the meal is informal... Eat hearty. Eat up. Chow down. Dig in. Gorge yourself. Tuck in. Pig out. Stuff yourself.

i like the french expression: Bonne Appetit in english good appetite

We say "bon appetit". Yes, it's French, but there are many French expressions and words in common usage in English, so much so that this expression is actually now considered to be English.

How to say the same words " enjoy your food " I mean what kind of words is another way to say enjoy your food?