Lots of little meals is my philosophy. I eat 400-600 calories every 2.5 hours. This equates to six meals a day. I'll bet this would help your body get into weight loss mode, as you're communicating to your system that food will always be there, so there's less need to store what's coming in as fat. One or two cups or tea or coffee (black) will help boost your metabolism also.

Also, consider mixing in a longer, less strenuous ride once a week. A lower heart rate will encourage your body to burn fat more efficiently, which might help the pounds drop off.