There are many other diets of this type with different names and claims but, if they talk about severely restricting the intake of carbohydrates, then they're probably forms of ketogenic diet. The process of "ketosis" is quite complicated and would take some time to describe but, in essence, it works because cutting down on carbs restricts the amount of blood glucose available to trigger the "insulin response". Without a triggering of the glucoseinsulin response some hormonal changes take place which cause the body to start burning its stores of fat as energy.
This also has the interesting effect of causing your brain to be fuelled by what are known as "ketone bodies" hence "ketogenic" rather than the usual glucose. The whole process is really quite fascinating and I recommend that you read up on it. Controversy All forms of ketogenic diet are controversial. Most of the debate surrounds the issue of cholesterol and whether ketogenic diets increase or decrease the levels HDL "good" cholesterol andor increase or decrease LDL "bad" cholesterol.