I find that if I ride an hour per day (or about 7 hours per weeks), I can eat whatever I want (love that chocolate!) and not gain weight. If I don't ride, I gain as much as 1 pound per week. I've just started riding again 12 days ago after almost 2 years of not being able to ride after neck injury and I'm already losing weight! I've lost about 2 pounds (my clothes are already fitting better) so far. (I gained about 20 pounds pretty rapidly after I had to stop riding, before I managed to cut my food intake enough to stop the gain.)