I lost 60 lbs over the course of 4-5 months a few years ago. Calorie restriction + sprinting. (250 lbs -> 190 lbs)
Later I water fasted and lost 25 lbs in 13 days. (185->160)
If you want to lose weight quickly calorie restriction + exercise, or water fasting are excellent options.
Water fasting is especially quick...and you aren't hungry after 3 days.
I'm currently hovering around 160-170, (my scale is brizzoke, Edit: Went to a gym this morning, I'm 162 w clothes and shoes). I've been eating Raw Vegan for about 2 weeks, eating far too much fat, but just about 99% raw. At first I was drinking a lot of juice and noticed visible losses, after adding a lot of nuts and nutmilks I feel like I've gained some back. I'm adding exercise (morning walks + sprints) to see if this is enough to spur weightloss. Otherwise i'll look into adding weight training or going on another waterfast. Waterfasts are fun
Hope that helps.