
Why are you on a DIET?
The Big Bang Theory Season 7, Episode 2

that she decided
to go on a DIET...
The Big Bang Theory Season 7, Episode 12

Sorry. I'll take a DIET Yoo-hoo
if you have it.
The Big Bang Theory Season 3, Episode 1

"Wil, do you want more Diet Coke?
The Big Bang Theory Season 8, Episode 20

But trust me,
you don't want it for a steady DIET.
The Big Bang Theory Season 2, Episode 4