Thanks for that Roselove.
I knew someone who was a police officer for the Metropolitan Police in London. He said he usually bowed his head over his meal in the police canteen and gave thanks. One day he thought that no one notices so he will give thanks while he was queuing for his food, then one day one of the servers said "You don't say your pctiryers anymore," He went back to his old practice.
As a teenager I was always shy, and went red and stuttered if I had to say anything. Then one day in our staff canteen of a national newspaper, I was with a friend who said let's pray. People were queuing for their food right next to us. That more or less cured me.
On my 70h birthday we went to a restaurant with about 14 of us. My son in law gave thanks in a loud enough voice for all in the room to hear. Afterwards I noticed that several people were smiling. Then I noticed that there was a giant Buddha in the corner, I don't know how I missed that before, or I would have chosen somewhere else, especially as at least one in law claims to be a Buddhist, but then he sometimes says he is a Quaker.
We once had 2 foster children aged 6 & 7 who we took to a park in Canterbury to eat our sandwiches. the elder asked if she could pray for the food and we said yes. Afterwards a couple at the same picnic table smiled and said they were Christians, but we noticed that they didn't give thanks for their food.