The only way to keep your health is to eat what you don’t want, drink what you don’t like, and do what you’d rather not.

In this wry, hyperbolic line, Twain satirizes the moralizing tone of health advice by reducing “healthy living” to a program of constant self-denial. The joke hinges on inversion: what is supposed to preserve vitality—diet, temperance, exercise—appears as a joyless regimen of doing precisely what one dislikes. Read as social commentary, it pokes fun at the late-19th-century/early-20th-century enthusiasm for reform movements and prescriptive self-improvement, suggesting that the pursuit of health can become its own kind of misery. The humor also carries a practical insight: discipline often conflicts with immediate desire, and people resent being told that virtue feels unpleasant.