In an age when health has become both personal and quantified, Samsung has embedded into its Galaxy Watch a quiet capability: the ability to read, through light and skin, whether a person is truly nourishing themselves. By measuring carotenoids—the pigments that accumulate in the body from fruits and vegetables—the watch translates the World Health Organization's abstract 400-gram daily recommendation into a number between 0 and 100, visible within five seconds. It is a small but telling moment in the longer story of technology reaching inward, attempting to make the invisible consequences of