It seems like most of us plateau after a year or so of continuous riding and diet adjustments. When I started riding I dropped about 40 lbs. in about 9 months. I had adopted a vegetarian diet a couple years earlier but the weight did not come off until I was riding just about every day, mostly from commuting. I still ride almost every day, but my average weekly mileage has tripled with the addition of fun/training rides. I still eat about the same amount as I did back when I only commuted, eating only fresh foods, but I cannot seem to get below an average 155-160 lbs. Not that I really care to, I am quite happy with my weight. I just think it is interesting how most of us seem to find some weight at which we plateau at, and it is different for each person. It probably has to do with acclimation to the particular type of exercise, and more efficient use of calories from cycling, or something like that.