Ketonic diet is also known as Atkins diet. Dr. Atkins was a cardiologist who first developed his diet in the early 70's. It is based on a low carb diet.

The diet is based on the theory that overweight people eat too many carbohydrates. Our bodies burn both fat and carbohydrates for energy, but carbs are used first. By drastically reducing carbs and eating more protein and fat, our bodies naturally lose weight by burning stored body fat more efficiently.