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Dietary advice seems to change every decade. Fat is bad, then suddenly it’s good again. Nowadays, for many people, carbs are the enemy.
But it turns out that healthy dietary guidelines can’t be boiled down into simple rules. A new crop of studies, which leverage the latest health testing and machine learning technologies, are finding that there’s no single diet that works for everyone. In fact, even identical twins process food differently.
The research undercuts a lot of guidelines that tech companies are using to sell their products to consumers concerned about their health. For instance, there’s a movement of Silicon Valley techies who believe that a ketogenic diet — which features extremely low carbs and lots of fat — can contribute to good health, and various products, such as monitors that measure ketone levels, that help people adhere to that diet. There are also many apps that help people fast, or restrict access to food during set times of the…