Giving thanks to God for our food is a common Catholic tradition. The Grace Before Meals prayer below is the standard bearer for saying grace among Catholics.
Grace Before Meals
Bless us, O Lord, and these Thy gifts which we are about to receive from Thy bounty, through Christ our Lord.
Grace After Meals
We give Thee thanks for all your benefits, O Almighty God, Who lives and reigns forever;
and may the souls of the faithful departed,
through the mercy of God,
rest in peace.