I try to always give thanks for the food I receive, and I also try to remember to give thanks again after I am done eating, because the Lord always did.
The common prayer was mentioned above, but sometimes the place or company may make this act of piety uncomfortable or perhaps not appropriate…after all, we are told for prudence to “
Be careful not to practice your righteousness in front of people in order to be noticed by them”, and sometimes this prayer, especially since it ought to begin with the Sign of the Cross, may give this false impression to others, even though the Lord knows that our intentions are pure.
I concluded that the Lord will still read my heart, but I may be tempting others into sins of thought - such as criticizing me or my gesture or who knows what else could go through their mind - so I keep the prayer inside: I trace a small cross with the thumb over the heart, and I pray mentally.
I also give thanks for those who are around me receiving food, for I know that in their heart they are also grateful