Almost all weight-loss diets with varying degrees focus on reducing calories or manipulating intake of one of the three essential macronutrients (protein, fat, or carbohydrate) to achieve a weight loss effect.
A glucose ketone index is a group of "high fat, medium protein" or "high fat protein" but a very low carbohydrate diet. The term ketogenic basically refers to an increase in ketone body production caused by an increase in the level of lipolysis (fat breaker). Ketones are a by-product of acids formed during the transition between "fat" to "fatty acids" by the liver.
The first set of ketogenic diets was actually developed as far back as the early 1920s by Johns Hopkins Pediatric Epilepsy Center and also by Dr. R.M. Wilder from the Mayo Clinic treats children with seizures that are difficult to control.
Today, promoters of the ketogenic diet are of the view that carbohydrates, especially those with a high glycemic index, are the main reason why people gain weight.
Carbohydrate foods are generally metabolized to produce glucose, a form of simple sugar which is generally considered to be the energy source of choice for the body because it is faster combustion energy.
Although the body can break down muscle glycogen (a mixture of glucose and water) and fat to produce energy, it prefers to get it from high glycemic index carbohydrates from the diet.