Why catchy health guidelines require careful examination.
Eat five portions of fruits and vegetables a day. Walk 10, 000 steps. Drink eight glasses of water. Sleep eight consecutive hours a night. These magic numbers are meant to keep us healthy. In order to optimize our well-being, smart apps track our hydration levels, our intake of greens, our sleep and, of course, our every step. Yet, supposed benefits aside, these targets have one thing in common: They all have their origins in marketing strategy—and in one case, a
Photograph:Gelcream for Into The Gloss
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