I went from 210 to 170 in about 3 months, last summer. My wife noticed my sleep apnea almost completely went away. I've noticed that I can tell when food has nasty stuff in it... I can taste it, and feel the effects afterwards. I have more energy, and I can ride faster, longer.
It's almost a year later, and I still get people stopping me and asking how much weight I lost... a lot of coworkers thought I was nuts at first. Now I've gotten a few of them riding after they saw the effects.