add some weight lifting , weight bearing, and resistance training along with a bit of core muscle training to your exercise routine. If you want to build mileage or weight, add no more than 10% per time and make sure you can then handle that weight or distance before increasing.

Biking is great for a non weight bearing and cardio especially if you add some speed inter vals, but probably not for weight loss. Adding some significant weight and resistance will add lean body mass/muscle weight to make up for fat weight loss, plus it will help you look and feel better.

welcome to the addictive world of biking and exercise- gotta love that natural seratonin rush.

marni