A ketogenic diet (or keto) is predominantly made up of high-fat foods — including butter, oils, meat, fish, eggs and cheese — and very low-carb vegetables such as cauliflower and leafy greens. This forces the body to burn fat for fuel, rather than glucose. In order to maintain that state, known as ketosis, followers typically restrict their carbohydrate intake to less than 50g a day. And, as protein can also be broken down into glucose, that has to be restricted, too.
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