Your friend swears by a low-carb plan and drops ten pounds in a month. You try the same approach and feel foggy, hungry, and frustrated. Is it willpower? Probably not. The real reason sits in your cells, your microbes, and the way your body processes a single bite of food. Hyper-personalized health—an offshoot of personalized medicine—is replacing guesswork with data, and it’s easier to start than you think.

The Fiction of the Universal Diet

For decades, nutrition advice has operated like a weather forecast for an entire continent. It assumes everyone responds the same way to the same inputs. But your genes influence how


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