Dropping you’re Cal intake from 4000 to 1200 you sure are wasting your time, you’re better off Fasting the natural way. If you go to low, you cannot have enough carbohydrates to actually burn fat. Fat oxidations requires substrates from the krebs cycle. If your deficient in these area's your body looks for other sources of energy. Which can come in the form of Amino Acids. AA usually account for about 4 % of total energy production under normal circumstances. So as Magic stated timing your nutrient intake is important.
I suggest consuming clean diet at 2100 calories ED watching your Macros you should be fine especially taking DBOL.