On WW I've lost 37 or so pounds since me and the lovely Missus started the program. About three months ago I increased my time in the saddle and frequency of riding substantially so now I'm riding 5 times a week and averaging over an hour on the bike per ride, without any changes to the diet. I'm also riding faster, with an average speed of a little over 14mph instead of 12 or so.
What I've noticed is that the riding has accelerated size loss (I'm getting thinner faster) but has slowed weight loss from about 1-1/2 pounds per week to about a half pound per week. I'm not disappointed at all, I feel great and am riding strong and the slowdown in scale weight loss doesn't bother me, but I'm curious why there would be such a slowdown in weight loss.
What I've thought is that this might be because of increase in muscle size (or mass) improving lean body fat ratio, but I don't know. What are some theories/facts that may explain what's happening?