Matthew Poole and continuators on Proverbs 23:2

2 And put a knife to thy throat , if thou be a man given to appetite .

Restrain and moderate thine appetite, as if a knife, or some other thing stuck in thy throat, and hindred thee from swallowing what thou didst desire; or, as if a man stood with a knife at thy Throat ready to kill thee, if thou didst transgress; or, though it be as irksom to thee to do so, as if thou hadst a knife put to thy Throat. So this is to be understood metaphorically, as that Phrase of cutting off the right hand, &c. Mat. 5. 29, 30. Or, For thou dost (or, left thou shouldst, as the Syriack Interpreter renders it; or, otherwise thou wiltst or shouldst) put a knife to thy throat. So the sense is, when thou goest to their Feasts, thou dost expose thy self to great and manifest hazards, to thy own intemperance, and to all its dangerous consequences, and to the ill effects of other mens intemperance.

Prone to excess in eating and drinking.