A ketogenic diet is one high in healthy fats, moderate in protein, and very low in carbohydrates. The keto diet forces the body to burn fat for energy, instead of carbohydrates, which is its default energy source.
In a normal diet that contains high amounts of carbohydrate, the body converts carbs into glucose, which is used by the body, as well as the brain, for fuel and any leftover glucose that is not used is then stored as fat.
In a ketogenic diet, also referred to as low-carb, the body has very little amounts of carbohydrates to turn into glucose, so it does the next best thing: it turns to the liver.
The liver, then, takes the body’s fat supply and turns it into fatty acids, which are converted into ketones and so begins the metabolic process known as ketosis, which uses the body’s fat stores for energy.
Ketones are also a major source of energy for healthy brain.