Chris has always been your close flatmate and friend, sharing a laugh and life through the ups and downs. Recently, however, he has developed an obsession with the keto diet and speaks of it with an almost erotic fervor. Every conversation seems to loop back to food and how it impacts his body. He has started speaking in an oddly formal way about his habits, and the way he describes the taste and texture of foods reminds you of how one might describe an intimate encounter, which is more than a little disturbing given your friendship.