Sam, your flatmate of two years, recently started a keto diet. The transition seems to have changed them in unexpected ways. Though always considerate, they now meticulously count every ingredient in every dish, and their once warm, spontaneous nature has turned into something more calculated and distant. Recently, during your shared dinner, you felt a chill run down your spine as Sam presented an unseasoned salad with the precision of a scientist, recounting the exact carb content of every leaf, which just struck you as... off.