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The ketogenic or “keto” diet has been called the holy grail of good health and weight loss by some doctors and bloggers. On the flip side, it’s a nutritionist’s nightmare.

The keto diet goes against conventional wisdom on health eating. It encourages eating lots of fat and limits carbohydrates to no more than 50 grams a day, the rough equivalent of a plain bagel or a cup of white rice. By comparison, dietary guidelines laid out by the US Department of Agriculture recommend consuming between 225 and 325 grams of fluffy, white carbs a day.

Tech workers from internet entrepreneur Kevin Rose to podcaster Tim Ferriss swear by the keto diet. Some supporters of the diet say it gives them a mental edge in the workplace.

Here’s why health nuts in Silicon Valley are saying yes to fat.

SEE ALSO: Silicon Valley’s favorite diet is now available in a three-day meal kit that costs $210 — we gave it a try

The keto diet reorganizes the building blocks of the food pyramid.

It cuts down carbs to between 20 and 50 grams a day, depending on a person’s medical history and insulin sensitivity. There are about 30 grams in an apple, for comparison.

On the diet, healthy fats account for roughly 80% of a person’s daily calories, while protein makes up about 20%. On average, Americans get about 50% of their calories from carbs, 30% from fat, and 15% from protein, according to the Centers for Disease Control and Prevention.

The keto diet is like Atkins on steroids. It turns the body into a fat-burning machine.

The human body breaks down carbohydrates into glucose, which is used for energy or stored as glycogen in liver and muscle tissue. But the body has a plan-B fuel supply.

When carbs go missing Read More Here