They would lose 'abnormal fat' not structural fat, or normal fat, or muscle mass. It's very easy to understand when you think about how the hypothalamus operates under VLCD restrictions, without the HCG, you would not lose the 'abnormal fat' but the structural fat, normal fat and muscle mass. It is the effect that HCG has on the hypothalamus that directs where the fuel will coem from. The abnormal fat was stored for famine conditions, so it requires famine conditions to release this fat, the HCG will allow you to burn up to 2000 - 2500 calories a day from your abnormal fat stores, this is why even on 500calories of food you will have plenty of energy to function wihtout felling deprived or hungry every 3 hours while eating such a low amount of cals, the hypothalamus controls your hunger via the HCG.