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  What is keto diet? The keto diet (short for ketogenic) is a very low carb, high- fat and moderate protein diet that turns your body into a fat burning machine. This involves drastically reducing your carbohydrate intake and replacing it with fat. This reduction in carbs puts your body into a metabolic state called  ketosis . Ketosis causes the body to produce small fuel molecules called ketones, which your body uses as an alternate source of energy when your blood sugar is in short supply. So, when you eat very few carbs or very few calories, your liver produces ketones from fat. These ketones then serve as a fuel source throughout the body, especially for the brain. The brain is a hungry organ that consumes lots of energy every day, and it can’t run on fat directly. It can only run on glucose. So on a Keto diet, liver undergoes gluconeogenesis, which means “making new glucose.” In this process, the liver creates glucose for the brain to use. It manufactures the glucose usi