in the pink @ 英語學習筆記

Edgar: How come you're drinking Coke? Didn't you tell me that you wanted to lose weight?
Zoe: Easy. This is Diet Coke, which allows me to drink what I want and still keep fit. It's like killing two birds with one stone!
Edgar: Just don't drink too much soda. According to a news report I read in the China Post, drinking more than one soda a day may result in metabolic problems -- even if it's sugar-free.
Zoe: Hmm.
Edgar: Besides, the best way to be in the pink is exercise regularly. Drinking sugar-free beverages to keep in shape is putting the cart before the house.

解析：in the pink == in very good health (非常健康)

killing two birds with one stone == 一石兩鳥
putting the cart before the house == 本末倒置

diet