Studies about sugar and how it's addictive? Jon's expression shifts to one of quiet, befuddled confusion. There's rarely time for studies in his own world so to think of them happening around food? Strange.

"It's far better than anything they had back in Westeros. At Castle Black, they threw whatever bits and pieces of old meat they had into a pot and called it supper."

Rancid stew was a staple there, but it was essentially a prison.

He takes another bite of one of the flat bread-like foods (a pancake, Jon). He's currently eating it plain because he knows no better.