13. Are you on a diet?
你在节食吗？
还能这样说：
Are you dieting?
Are you going on a diet?
谚语：
Diet cures more than the doctor.
药补不如食补。
14. Where do you usually have breakfast?
您平时在哪儿吃早饭？
还能这样说：
Where do you often settle your breakfast?
Where do you breakfast?
谚语：
Faults are thick where love is thin.
一朝情意淡，样样不顺眼。
15. He is a gourmet.
他是一个美食家。
还能这样说：
He is a lover of good food.
He is a real epicure.
16. The old lady knows everything about healthy food.
这个老太太深谙健康饮食之道。
还能这样说：
The old lady knows how to have a healthy diet.
The old lady is familiar with healthy eating.
应用解析：
To your health! (=Your good health!)
（敬酒时用语）祝您健康！
17. Eating regularly is every bit as important as having a healthy diet.
规律饮食和健康饮食同样重要。
还能这样说：
Regular eating is as important as healthy diet.
It's of the same importance to eat regularly as to have healthy food.
应用解析：
a bit 稍微，有一点儿；
bit by bit 一点儿一点儿地，逐渐地；
a bit of all right 非常吸引人或讨人喜欢的