Till date we always have been saying Bon Appetit,before we begin.When I was a kid my grandpa taught me a certain chant to say before one begins their food .It has much Similar implications of Bon Appetit but much deeper meaning and much higher emphasis on food as a part of god:)
We used to always say it when we were kids.Gradually with quick lifestyle,we lost teh emphasis.But still during Ganesh Chaturthi , Weddings an Functions it is still chanted and is considered very auspicious.
It goes this way
"Vadani kaval gheta nam ghya shree hariche.
Sahaj havan hote, nam gheta phukache
Jeevan kari jivitva anna he poornabrahma
Udarbharan nohe janije yadnya karma"
Jai Jai Raghuvir Samarth
Meaning is as follows(I am not sure of the exact meaning,but tried to apply my own and also have seeked some research on this.Please forgive me if i have said anything wrong)
While taking a mouthful of food, chant the name of God
The food is easily offered as a offering to god when his name is said
The food gives life to us as it is completes God Principle
Having food is not just filling the stomach but is a type of fire-sacrifice (Yajna)