Nothing tastes as good as thin feels.

The line contrasts immediate sensory pleasure (the taste of food) with the longer-term satisfaction of achieving or maintaining thinness. It functions as a slogan of self-denial: the fleeting reward of eating is framed as inferior to the enduring reward of a slimmer body and the social/psychological benefits associated with it. In modern usage it often appears in diet culture as a motivational maxim, though it can also be read critically as reflecting (and potentially reinforcing) body-image pressure and disordered-eating logic by equating “thin” with virtue and well-being. Its punchy antithesis makes it memorable and easily repeated.

“Nothing tastes as good as being thin feels.”
“Nothing tastes as good as skinny feels.”