Personally I've always found the mental effort of getting more exercise easier than the mental effort of trying to restrict my diet.
Travelling in Europe and eating "good" food doesn't get me to lose weight if I don't get a bunch of exercise regularly. Being in Canada and consistently exercising with North American crap food does.
The most weight I've ever lost in my life was while cycling to school and work regularly, and eating fast food multiple times a day. I can't out eat regular 50km bike rides.