1.   Do not let such foods ruin an appetite for healthful items like low-fat milk.

2.   English afternoon tea, on the other hand, is a mid-afternoon indulgence, designed to stave off hunger without ruining your appetite for dinner.

3.   It would ruin your appetite.

4.   It will ruin his appetite.

5.   The imbroglio had ruined his appetite for courtrooms.

6.   The virus is harmless to humans but destroys animals hooves and causes mouth blisters that ruin their appetite.