Low calorie diets work on the simple principle that calories give us fuel for all the activities and functions are bodies undertake. Therefore, if you reduce calories to less than the body requires, it will burn fat to replace them. If you are eating fewer calories than your body needs so forcing it to
burn fat, you are inevitably going to feel hungry. Additionally, your stomach is probably accustomed to large portions. Eating smaller amounts is not going to satisfy you until your stomach becomes used to the new regime. Such diets may help in losing kilograms but the overall nutrition requirement of the body is not served hence leading to complications.
The diet may sound very easy and simple to follow but is a risky affair.