He can't eat cheesecake.
He's lactose INTOLERANT.
The Big Bang Theory Season 1, Episode 16
- Here. Have some pizza, sweetie.
- Penny, you know I'm lactose INTOLERANT.
The Big Bang Theory Season 3, Episode 6
that he's not really
lactose INTOLERANT, hmm?
The Big Bang Theory Season 11, Episode 17
- Right. No. I'm lactose INTOLERANT.
- Right.
The Big Bang Theory Season 2, Episode 1
Leonard's lactose INTOLERANT.
He can't eat anything here...
The Big Bang Theory Season 4, Episode 4