I lost a lot of weight when I first started riding and was tracking faithfully on weight watchers. I would sometimes have an after-ride mocha but would not eat pastries, ice cream etc. I was only riding about 15-25 miles most of the time and didn't need to refuel too much on the rides.
Now I ride further and like Mimi said, am often really hungry even on days I don't ride. It's a balancing act. I eat extra if I know I'm going to ride a long way on consecutive days, and I'm still really hungry on the next day.
So I can't seem to get rid of 5 lbs that crept back on, but I'm not actually gaining weight back even though I'm not quite as careful about tracking.
2016 Specialized Ruby Comp disc - Ruby Expert ti 155
2010 Surly Long Haul Trucker - Jett 143