He returns with an improved appetite and he indulges it.
Soon his vacation benefits have worn off, together with his vacation tan.

The muscles slacken again, the waist-line increases.

He feels a little remorse over the way he has broken his good resolutions, but of course he cannot neglect his business.

Then, after a hard week, followed by some carelessness or exposure, he thinks that he has the grip or a cold.

He is lucky if he stays at home and calls in his physician.