Adam Clarke's Commentary on the Bible

Verse 1 (Proverbs 23:1)

When thou sittest to eat with a ruler - When invited to the table of thy betters, eat moderately. Do not appear as if half starved at home. Eat not of delicacies to which thou art not accustomed; they are deceitful meat; they please, but they do not profit. They are pleasant to the sight, the taste, and the smell; but they are injurious to health. These are prudential cautions; and should be carefully observed by all who would avoid the conduct of a clown, and desire to pass for a well-bred man.

- Adam Clarke's Commentary on the Bible