The Science of Fasting

I've been on a fasting regime for four weeks, since I hit 200 lb. on the bathroom scale. Goal weight is 175. I fast for 36 hours every Wednesday...no food from supper Tuesday night until breakfast Thursday morning. Nothing but water. Eat normally the balance of the week.
Have lost 8 lb. so far. Hunger pangs at dinner time go away after a few hours...drinking lots of water helps.