I haven't read all the posts since my last one but something I forgot... Make sure you are getting some sort of impact exercise, running, walking, weights. There have been threads on osteoporsis but bone stress can really be an issue if you are only doing low-impact like cycling.

My mother works with a woman who was once a serious cyclists, 100+ miles a week but did nothing else. Her bones became weak and actually stress fractured. She asks my mother everytime she sees her if I am still only cycling and expresses her concern if my says yes. I know my own doctor has expressed concern about making sure I am getting some sort of impact exercise, he was very upset when I had stopped running. I don't know the full issue but may want to discuss with your doctor if that is a concern.

Not to mention variety seems to up my weight loss.