Had a question about exercise. I am a school teacher with 2 small kids of my own, with little time to walk. I love to power walk to lose weight. My summer vacation is coming up and I get 3 months to powerwalk in the mornings. My question is how important is dieting when exercising? The last time I tried to lose weight, I ate fewer calories and lost all energy to walk. At this point, dieting seems a waste of my time. I don't mind eating less junk food, but if I am powerwalking 1 or more hours a day, how important is calorie restriction? Can exercise be enough? Or at least the most important part of my weight lose challenge? I am looking forward to my vacation months very much and want to give it all I got, no mistakes this time.