A study found exercise may be bad for your health. Which means I'm not fat, I'm just morbidly over-healthed.

The line is a characteristic Colbert-style inversion: it takes a sensationalized health headline (“exercise may be bad for your health”) and pushes it to an absurd personal conclusion. By reframing “fat” as “morbidly over-healthed,” the joke satirizes both the media’s tendency to overstate or misread scientific studies and the way people cherry-pick such claims to justify comfortable habits. The humor depends on mock-logical reasoning and euphemism—turning a stigmatized condition into a supposedly positive excess—while also poking fun at the cultural obsession with wellness metrics and the moralizing language often attached to fitness.