Magic Diet

I met a doctor during my clinical rotation in a hospital. While I was walking out and getting ready to go home, he stopped me.

Doc: So what’s the secret diet to lose weight?
Me: There’s none. You have to decrease the total amount of calorie you consume and try to increase physical activity.
Doc: I don’t exercise that much. Look at my belly.
Me: Yea, it’s hard. You are tired from work when you get home, but you need to motivate yourself. Try to start with something small.
Doc: Yeaaa, are you sure there is no magic diet?
Me: … … …

The magic diet is called there-is-no-shortcut-eat-a-balanced-diet-get-up-and-move ____ ___.
Nice try, doctor.