I've been cycle commuting for about three months now, and put in on average 65-80 miles per week. It took a while before any wieght started to come off and in fact, I actually gained wieght the first month. My legs got huge and my waistline shrank, but I still gained wieght. I finally managed to lose 25 lbs when I started eating tons of pasta and rice and plenty of veggies. I don't believe the Atkins diet is appropriate for cyclists, it didn't work at all for me. I'm down to 220 from a high of 245 on my 6'2" frame.