No obvious next action

This has been bugging me for some time.

Let's say my project is "Stop drinking coffee"
What is the next action? Not drinking coffee? This
is hardly an action. Not drinking coffee for one day?
Again, it is too long to be an action and it is more
not acting than acting.

There are several of those projects where I do not
find actions and those are the ones that do not get done.
Other example : Changing my diet.
Or one as simple as "shave everyday". Next action? Shave tomorrow?

Maybe I'm missing something. Thanks for your help.