
...and their potato-based DIET.
The Big Bang Theory Season 8, Episode 22

How hard is 65% Coke,
35% Diet Coke?
The Big Bang Theory Season 12, Episode 23

I know, it's not
on my wedding DIET.
The Big Bang Theory Season 5, Episode 16

It's probably this
stupid DIET I'm on.
The Big Bang Theory Season 7, Episode 2

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