I lost my appetite.
→식욕을 잃었어.

〔예문〕
A : Hey, What's up ? Don't you like Japanese raw fish?
   왜그래? 일식생선회싫어?

B:Oh,no. I can't eat the fish uncooked.
   음,싫어.날 생선은 못먹겠어.

A:Come on. You will like it.?
  먹어봐.맛있어.

B:Sorry, but I think I lost my appetite.
 미안해.입맛이 없어진것 같아.