Any dietary strategy that lowers glucose and insulin to levels at which the body produces ketones and switches to burning fat for energy.
A ketogenic diet typically lowers carbohydrates enough so your body switches from burning glucose (sugar) for energy to burning fat, either stored body fat or dietary fat. As a result, your liver creates ketones, which your brain and body can use for energy.
Eating between 20 – 50 grams of carbohydrates per day will result in ketosis for most people. Physically active and metabolically healthy individuals may be in ketosis at higher carb levels up to 75 or 100 grams per day.
A ketogenic diet supplies adequate protein, usually between 15-30% of calories, and the rest of the calories come from fat.
You can achieve ketosis with multiple types of diets, including vegan, vegetarian, Mediterranean, omnivore, and carnivore.