amadeus,
your body does not intuitively think "oh, this person is fasting so that i can get rid of my excess fat and, therefore, rid myself of my fat-trapped toxins, the sensible thing to do would be to oxidize as much fat as i can during this time". Your body thinks "i am starving... i must store what i can". True, fat will be utilized but in the event of starvation, which is what fasting is, 50% of the weight lost from fasting is muscle tissue. This means that when you lost your 40lbs on your 3 week fast (which is an unbelievably fast and dangerous weight loss rate, the recommended weight loss rate is 1lb/week) 20 lbs of that was your lean tissue (muscle). Every pound of muscle burns 50 calories a week while at rest. This means that your daily resting metabolic rate, after your fast was down 1000 calories a week! This is enough to gain 2 pounds a week if you returned to your old eating habits, which many of the people who attempt to do a fast like this do.
You will not find one proven, scientific source that will tell you that fasting is good for you. And, if you are one who is skeptical about science and who likes to dwell on the short-comings of science please keep in mind that advances in science are what have increased life span and advanced medicine.
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