I found this on a calorie counting website: Cycling at an average of 14-16 MPH will burn 567 calories an hour.

That applies to my height and weight... 5'4", 122 pounds.

It might be a good idea to figure how many calories you are taking in and how many you are burning when exercising.

You can go here: www.caloriesperhours.com, to find out. Surprisingly enough, cycling is not a top calorie burner.

Now... I will tell you that before I ride in the morning, I will eat a fake bacon sandwhich (230 calories) and a bagel with PB (estimate 350 calories). This past weekend, I rode from 7:15 AM to 10:30 AM, 40 miles, at an average of 16 MPH, and I didn't feel tired or hungry, and I didn't eat again until 11:30 AM. So, yes, I carb loaded before I rode, but I also didn't stuff my face at every rest stop.

People really over estimate HOW MUCH they need to EAT while riding. If you aren't going really fast and really far, you don't need that much to carry you through a ride.

But in the end... to lose weight... it's all about calories in and calories out. This can only be achieved through a daily food diary, knowing how many calories your body burns at resting weight (I know 24 Hour Fitness can test for this), and how many calories you are burning when you workout.