More than a few readers may squirm as they nibble their way through Sophie Haigney’s latest, about eaters who are rejecting “the usual sources of authority” and tinkering with optimization through unconventional diets—upping their intake of raw buffalo brain, for instance, or swearing off vegetables. But Haigney’s not in it for the disgust or the judgment. Instead, she moves among “dark nutrition” practitioners with a deep curiosity for how they try to manage uncertainty through appetite.

It was like any other absorbing pastime: You could tunnel deep into nutrition, endlessly studying and adjusting your diet, treating your body as an ongoing experiment. When traditional researchers do experiments, they use n to represent the sample size, like the number of individuals tested. Dark-nutrition circles were constantly talking about the “n of one” — the idea that the only way to learn what is good for you is by ignoring broad samples and experimenting on your unique self.

Las manchas en la piel del rostro son una de las alteraciones dermatológicas más comunes y uno de los motivos principales de consulta con el dermatólogo. Se las conoce técnicamente como hiperpigmentaciones y aparecen cuando existe una sobreproducción o alteración en la distribución de melanina, el pigmento responsable del color de la piel. Los melanocitos son las células encargadas de producirla y son diferentes factores los que pueden estimular su actividad.

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