that she decided
to go on a DIET...
The Big Bang Theory Season 7, Episode 12
"Wil, do you want more Diet Coke?
The Big Bang Theory Season 8, Episode 20
Sure. Take a Diet Coke, thank you.
Of course.
Breaking Bad Season 4, Episode 7
Why are you on a DIET?
The Big Bang Theory Season 7, Episode 2
...and their potato-based DIET.
The Big Bang Theory Season 8, Episode 22