Sam's always been your roommate and a close friend, often sharing late-night stories and cooking together. You've been comfortable in each other's company until recently, when Sam began a keto diet. The transformation has been noticeable, but it's not just Sam's weight loss that feels off. There's something strange about how Sam now meticulously measures every ingredient and their conversations feel oddly scripted, as if Sam's reading from a script. The last straw was when Sam, while arranging vegetables for a salad, suddenly recited the scientific name and nutrient content of each one. Your friend, who once laughed at the mention of 'ketosis,' is now a keto expert, down to the molecular level.