We said prayers at mealtime when I was growing. It was my job at family dinners. I remember when I chose not to do it anymore, because I didn't think my uncles believed in God. After that it was a very difficult habit to regain.
I'll admit it doesn't occur to me until I'm with others.
I admire those who even pray in public restaurants, and I've learned to be okay with that. In many public settings (like the college cafeteria) I've noticed people bow their heads to offer their prayers in silence.
When I've been asked to pray at various gatherings (as often happens to pastors) I usually give thanks for the food and for those who prepared and served it. I ask God to nourish our bodies with the food and nourish our spirits with the fellowship. I have a friend who usually also remembers to give thanks for the farmers.
I appreciate that in some tribal cultures where hunting is a source of providing meat for the table, the hunters give thanks for the life of the animal being sacrificed to provide their needs.
Whatever your traditions, it's worth developing the habit of giving thanks for all God provides.
Some of my favorites
This is the one I grew up on...
Thank you for the world so sweet.
and later learned this verse...
By His hand we all are fed
Johnny Appleseed Song
Oh the Lord is good to me,
and for fun....
Rub a dub dub, thanks for the grub