The Ketogenic diet is a term for a low-carb diet which is similar to the Atkins diet. The idea is for you to get your calories from protein, and fat, and less from carbohydrates sugars.  Like, soda, pastries, and white bread within your meal.  Eventually you will run out of fuel (blood sugar). You’ll then start to break down protein and fat for energy, which can make you lose weight from a system called ketosis.