Losing a Few Inches

I want to lose a couple of inches off my waist.
If I do a three-day fast that I won't enter the fat burning zone, as it starts from day 4 onwards.
Can someone explain to me, how on previous 14, 21 day fasts whilst paying attention to my weight daily. On days 1 to 3. I did lose weight.
The weight came off at a rate of 1 kg every day for the first 7 days and then half a kilo etc....
I don't understand, if days 1 to 3 are not fat burning zone than what weight is coming off, it can't be water as I am drinking. It.

If I do a five day fast and abdominal exercises on days four and five. Then I should lose the inches. I desire.?